I attend the Tridentine Mass at a diocesan church, and I haven’t noticed any particular “attitudes” there. A priest who used to be the officiant has moved out of the area, and since we have a couple of different priests there now, people have seemed to relax a bit instead of being as rigid as they used to appear to the casual observer.
After one of the hottest summers on record in these parts, the weather deteriorated markedly over the last couple of weeks, and it’s cold and rainy. I went to the Tridentine All Saints’ Day Mass yesterday evening. Plenty of people there were wearing fairly casual clothing and bundled up against the weather in parkas. So don’t worry too much about what you’re going to wear. Just dress the way you would if you worked in a conservative office. I don’t know if you’re a man or a woman, but a lace chapel veil isn’t necessary, either. Any head covering (hat, beret, scarf) is perfectly acceptable.
Instead of bringing an old missal you either had, or have purchased, the first couple of times you go, you might want to either not use a missal at all, or use the red missalette that are handed out before Mass. I’ve heard that the missalettes contain the rubrics with more easily understandable “cues” than a big daily or Sunday missal does, and I’ve also heard that they have pictures so you can more easily follow along with what Father is doing on the altar. Until you get the feel of the Mass, trying to follow along in a big missal is a daunting and possibly futile exercise, anyways. That’s just my opinion, of course, and
Remember, a significant part of priest’s prayers in the Tridentine Mass are inaudible, so trying to keep up with it for a newbie is really difficult. Things such as the Confiteor, the Credo, and the Epistle and Gospel will be obvious at the beginning of Mass. Actually, because there are very few audible responses from the people, it’s a little easier to blend in than at an Ordinary Form Mass. And you’ll probably be able to manage a few “et cum spirituo tuo’s” with aplomb!
Be prepared to do quite a bit of kneeling, and I’m just going to give you a heads-up on that point in case you have bad knees. If you can’t manage kneeling, just scoot forward on the pew and let it support most of your weight. God doesn’t ask the impossible from us.
In short, just go and enjoy. Enjoy being in the presence of the Lord in such a beautiful setting! Priests aren’t going to castigate you if you’re off-step. Laymen probably won’t either, and if they do, who cares? What do they know, anyways–LOL!
Hope you find the experience of this form of the Mass a new and rich motherlode of treasure for your faith!