This advice might be too little too late for those of you next week, but if it can be helpful for anyone...
I have been struggling mightily with confidence and have seen my scores dip significantly in the past couple of weeks. Part of the struggle is due to the fact that the last time I sat for the test, I massively underperformed and was miserable over my score. So miserable that I swore off the LSAT/law school for several years.
Once I got back into prep, I decided that I was going to save that PT for right before the test to prove to myself that I was much better prepared, could do this, blah, blah, blah. I hadn't looked at the PT since getting my score back so it was essentially fresh. (Did I mention that I swore off the test for so long that my original score is no longer on the record? (Gross I'm old/thank goodness.))
Long story short, I went from a 160 to a 176, and was one question away from a 180 in BR.
I say this not as a humble brag (ok, maybe a little bit of that) but because I have more confidence now than I've had at any point in my prep. I think a huge mental hurdle for retakers is the fact that you KNOW it can go sub-optimally. But by taking the one that originally got the best of you...well, you get what I'm saying.
(Also, major props to 7Sage because even if I hadn't underperformed as much as I did, I still wouldn't be close to the level I'm at now.)
That's stressful that they changed the date on you so last minute; I'm sorry.
I'm not sure why my letter was different (maybe it's dependent on test center and/or accommodation?) but mine told me that I was responsible for contacting the test supervisor to confirm accommodations and it wasn't optional:
This confirms that testing accommodations have been made for you to take the Law School Admission Test (LSAT) at the test center listed below. Please contact the test center supervisor, whose name is provided below, at least one week prior to the test to confirm your testing arrangements. If you do not contact the test center supervisor at least 48 hours prior to the nationally advertised test date, you will not be able to test, because supervisors are instructed to return the test materials to LSAC, if arrangements have not been made by this time. The accommodated administration of the LSAT will no longer be available to you. We request that you also contact the supervisor if you will not be testing.
All this to say that yes--definitely confirm with your test site, whether or not it was requested by LSAC. (I know that we are within the 48-hour window, but if there's anyone out there who hasn't confirmed and were supposed to, maybe try calling as soon as possible and fingers crossed your supervisor will be cool.)
Also, friendly reminder to print your accommodations letter along with your ticket.