I'm in the same situation as you and it's making me really nervous. I used the same picture in June and it was fine (I only noticed this morning that the picture was too small) but I've heard horror stories about proctors on power trips.

In June, I got there at 12:10. Some people were already there but most people got there about 5 minutes after me.

Week leading up to it: I took 1 PT at the beginning of the week and another one towards the end of it and did a few sections the other days. Just to keep momentum going (Personally, if I don't touch LSAT material for a week, I know I'm going to forget some stuff). I know that a lot of websites only suggest doing one PT the week leading up to the LSAT but I followed the study plan I had and it worked for me. I didn't try any new techniques though, I just stuck to what I knew and I did mostly "confidence boosting" sections. (LG is my strongest section so getting a few games in makes me feel more confident).

Day before: I didn't do anything LSAT related (besides making sure I had my plastic bag and my lsat ticket ready). Just took it easy, relaxed, went shopping and went to bed at a reasonable time. Definitely don't take a PT the day before and if I were you, I wouldn't even do any individual sections. If things go poorly, you're likely to lose some confidence and it could affect you going into the actual thing.

Day of: I didn't do any warm-up questions. There was probably about an hour between the time when we were allowed to go into the room and when we actually started the first section so I probably wouldn't have been "warm" anymore by the time we started but that's just me.

Good luck!