I was in a Catholic wedding this past weekend, also without the mass, and it was honestly VERY similar to a regular wedding.
There was no kneeling at all, for one.
Basically, priest and groom walked in, then the grandmothers and mothers, then each set of attendants (the priest and wedding coordinator had told us were/how to stand the day before). The only difference here was that we were asked to nod our heads at the alter before we took our places, since that’s a sign of respect to Christ.
Then, the bride and her dad came in, he passed her off to the groom, they walked up together.
At that time, the priest greeted us, and everybody sang a hymn together (there was sheet music for us to follow). The priest said some more things about the importance of marriage (everyone was standing) and then when he asked us to be seated, the wedding party took their seats in the first row, and the bride and groom went and sat down in their chairs at the side under the Virgin Mary statue.
There were 2 readings, a cantor (song sung by a friend of the bride), the priest gave a short sermon, then another hymn (everyone was standing for this) and then when he asked everyone to be seated, the wedding party went back to the front for the marriage vows.
This was more or less the same as regular marriage vows, except the rings were blessed with holy water first, and after the vows but before they were blessed and announced as husband and wife, the bride and groom paid tribute to the Virgin Mary by walking over to their mothers, taking a rose that each of them had carried in, and then placing it at the feet of the Virgin Mary statue while Ave Maria was sung.
After that, the priest blessed them, and then announced them.
All in all, it was about 45 minutes long, and the priest gave everyone cues on when to stand and when to be seated…. it really was almost exactly like every other wedding ceremony I had been to, except that the whole group sang 2 of the songs, and all of the songs were religious in nature.
I hope this helps- have you thought about meeting with the priest to discuss the ceremony ahead of time? I’m sure that he would have a better idea of how they perform the ceremony than anyone.