Agreed,

We have a very limited and weak amount of willpower. If we have a big project to finish, counting solely on willpower is futile. Instead, we should put ourselves in a position where the amount of willpower necessary is dropped. Like what Annoyance described, with time pressure, suddenly it is easier to get working (would make a nice discussion to see what tricks others use to minimize their required willpower).

Of course, it takes a bit of willpower to set up artificial pressures, but is worth it for chronic procrastinators.