I attended an indult TLM for the first time yesterday and was quite confused about when to stand, sit or kneel during the Mass (and since I wanted to get a good view, I sat at the first row as I use to during Mass, but realized later that it maybe wasn’t that smart). From what I had previously seen in videos, it doesn’t look to be at the exact same parts as in the NO, and it even seems like the whole congregation doesn’t need to do the same thing at all parts. What is correct, really?
Don’t feel bad about it though, that’s why on another thread I suggested that it is a good idea to sit closer to the back the first time. Just so that one may observe and take it all in, all the beauty and the reverence. If you have a 1962 or earlier missal, they often give cues as to sitting, standing and kneeling and you can follow along with the missal. You will become more comfortable about sitting towards the front and more knowledgeable, every time you go.
I’ve been going to the TLM my whole life (I’m 33), and at some parishes I’m completely confused with their local ruberics.
Strictly speaking, there are no ruberics for the congregation in the TLM. There are formal and strict ruberics for the priests, and slightly less strict rules for the altar servers and choir*, but beyond the Communion rail you pretty much just follow the rule of “when in Rome…”
Doing what everyone else is doing is made more difficult by sitting in front. This is particularly the case at Communion time, especially if the local customs are a bit different than you might expect.
*I’m referring to the ecclesiastical choir, a section of the Chapel between the Communion rail, which a lot of Chapels don’t have. I would include a link to a picture here, but I don’t have any handy that illustrate (pun intended) this point.