i would look at the manual and install the computer software tonight and look through it..you will be at some point, might as well now. Since I had done the saline trial, i already knew how to use the pump so i didn't read the manual, though i was told to look through it the night before, but i did install the program and check it out to see all the functions and how to hook everything up.
it's pretty normal(i think) to be nervous. i had an anxiety attack more than a few times the month leading up to actually getting approved and getting the pump. especially when i was doing the saline trial to see how i would handle having it attached 24/7, i think i had about 3 during that period.
once i got on it though, it got easier. i still get that feeling once in awhile(it's only been a month for me, and i've been MDI for 16years so it's a huge change) but it goes pretty quick. it's too bad you didn't get a saline trial while you waited, that might have helped you a bit, especially with the whole school thing...since you could just take it off at any point if you decided you need a break for a few hours or a few days...but I don't think you should have a big problem. I don't even bother to tuck my tubing in half the time honestly, and no one says anything(except my mom cuz she says it'll get tugged on...which has happened haha).
i agree with your doc on cutting your lantus...i didn't discuss that with my trainer or my endo and did a full 20unit dose of lantus in the morning, got on the pump in the early afternoon..and even though we set a temp basal of -50% until midnight, i had a huge drop in my bloodsugar because the lantus was still active and my first night on the pump wasn't that fun because of it. I think I got to bed finally at like 4 or 5am? either way, it's a good idea and you probably won't really notice it's only 21units instead of 41units honestly..and you'll be thankful tomorrow!