[TaintedRogue]

Get plenty of exercise and do not get drunk for the next two weeks. No more than two drinks in an evening and get 7hrs rest every night. More exercise the better.
Spend all of your free time reading 2+2 & watching tournaments, taking notes and work on that book on tournament poker, that will never get published, but will improve your play if the info is correct.
If you smoke, cut down. Keep a notepad and write down every time you have a smoke and try to increase the time between smokes.
Eat 3 hrs prior to tournament. Have snacks available. NEVER leave the table. NEVER miss a single hand. Have a bucket available for taking a leak in case of emergency.

Consider every hand that goes to showdown (where you did not play) and you did not make some kind of note, a failure on your part.

Get everyone out of the house, or wear earplugs.