Everything TTA just said is very relevant. Especially the part about 15 minute levels being really quick. Its gonna feel faster than a five minute online turbo. Pay attention to who limp calls and who limp folds. If you got a few players in the pot don't be afraid to 3bet squeeze, or jam if they limp/fold. Be hesitant to call off your stack, but don't be afraid to shove. In my recent live tourney I was all in 20ish times after getting crippled to 10 big blinds and being short all tourney. I only got called 4 times, sooo just pick good spots to shove where your most likely getting folds and if you get called you are 40%+.