I have recently begun to attend a Ukrainian Catholic church. Yes, I am a Tridentine refugee. I've heard that some Byzantines aren't crazy about Tridentines that visit your parishes and pretend that they're "know it alls" about your rites. However, I do respect your traditions very much and have years of learning before me. I try to be quiet, observe, and learn what I can over time. However, I am still quite Roman at heart. I do not bring my Roman devotions (especially the Rosary) to church with me. Those stay at home.
Jordan,
Firstly, welcome to the forum.
Secondly, please don't believe that we hurl anathemas at Tridentine refugees, use rosaries to tie millstones about their necks, and quietly drown them in the holy water fonts foisted on our churches in the days of latinization. It's only half true - those fonts aren't deep enough; we use baptismal fonts instead.
Seriously, however, the days are generally now long past when our temples were regularly besieged by refugees of that ilk. And, in our collective memory of those things happening, we invariably paint pictures of it as having always been a negative experience and interaction.
It wasn't and, on no small number of occasions, parish rolls were swelled by those who, in time, became fully participating, observant, and beloved members of our spiritual families. We're oftentimes more inclined to remember and speak about the bad experiences, forgeting that some of those with whom we've now stood shoulder to shoulder in worship for decades weren't always there.
Your opening paragraph makes clear that you understand what the issues were (and can still be) and that you are actively seeking to not contribute to any negative impression of newcomers. For me, that makes you a more than welcome guest in our temples - for as long as you choose to be and, if in time you find that you want more than to be a guest, more power to you.
My apologies for pontificating; on to your inquiries. I've reversed the sequence of your two paragraphs because it seemed to flow better for me in answering.
How do I prove to the priest that I am a Catholic? Do I have to have a RC priest that knows me well vouch that I am baptized and confirmed in the Roman rites?
You don't ordinarily need to prove to the priest that you are a Catholic, neither to worship there nor to receive the Mysteries. It isn't any different than if you were away from home on holiday, woke up on Sunday morning, visited the local Latin Catholic parish, and - because you knew that you were properly disposed spiritually - chose to receive the Eucharist.
Just by way of explanation (and you may have read this somewhere and thus formulated your inquiry), if you were an Orthodox Christian and visiting an Orthodox parish other than your own, you would indeed be expected to afford the priest with assurance that you were Orthodox and in good standing with your church. Clearly, the Orthodox praxis is a better one, but it isn't one routinely followed in Catholic churches - Eastern or Latin. Why? I don't know with certainty, but probably because the large number of congregants in Latin parishes doesn't lend itself to priests being aware of who belongs and who doesn't. In the case of our parishes, I'd guess that, historically, it probably wasn't an issue often enough for a process to be put into place.
You speak as if you have been attending the Ukrainian parish for at least a short time now. If it's typical of most Eastern Catholic parishes, the congregation is not large and it's likely that the priest knows most - more likely, all, of them. So, he's probably noticed you.
Make a point to introduce yourself to him after Divine Liturgy. If there is, as is common, a coffee hour afterwards, that's a perfect opportunity to do so; if not, just wait and accost him. A brief conversation is all that's needed, 'Bless, Father, I'm ____ . I'm from St Murgatroyd's, but I'm interested in learning more about the Eastern Catholic Churches. I've been attending Divine Liturgy for a few weeks now. You have a beautiful church and I'm looking forward to learning more about the East in the coming months. Just wanted to say hello.'
I want to confess with the Ukrainian parish priest so that he knows I am fit for Sunday communion in his church. I will not approach the priest for Confession until after Easter since I am unused to following the Eastern lenten fast. Roman lenten fasting is extremely lenient, as everyone here probably knows.
Your desire to confess to establish in the priest's mind that you are spiritually prepared to receive the Mystery of the Eucharist is laudable, although again not strictly required. (As with the point made above, if you were an Orthodox Christian, there would be a definite expectation that you do this; alternatively, you wouldn't be communed. Our Churches, however, do not impose such a requirement. The onus is on you to know that you are prepared or to not receive if you are unprepared.)
You certainly, however, do not have to wait until after Pascha. If I understand you correctly, you're thinking that you should do that because you don't feel certain of your ability or willingness to keep the Eastern fast. You are a Latin Catholic, not an Eastern Catholic. You may, therefore, should you choose, maintain our fast; however, you are not obligated to maintain our fast - only your own. So, don't let that be a factor for you.
As far as the process and form of the Mystery of Confession, that might vary somewhat depending on the parish you're attending. If it is latinized, they may still be using confessionals; if not, then the Mystery is traditionally taken before an icon, at the front of the church.
The
website of St Elias UGCC in Brampton ON [saintelias.com] has a wonderful variety of reference material on it which, I believe, includes an explanation of how the Mystery of Confession is traditionally done. If my memory on that point is incorrect, come back and say so, and someone will point you to a good description.
Meantime, please, feel free to ask any questions you have and we will do our very best to answer them.
Many years,
Neil