Getting Nervous

OK, So I know that I can swim .9 miles.  I can bike 24.8miles and run (if you can call what I do running) 6.2 miles, but can I bike up those mountain hills?  and can I do each by their respective cut-off time?  Especially since I have the disadvantage of being in one of the last groups to enter the swim water?  Will adrenalin pump through me that day and make me faster, or will I get no sleep the night before and be so tired and nervous and intimidated by the hills that I go too slow and am disqualified from the race?