It's like an old poster I saw - "The first 90% of the job takes 90% of the time; the last 10% of the job takes the other 90% of the time."
"The first 90% of the job takes 90% of the time; the last 10% of the job takes the other 90% of the time."
Was it Yogi Berra who said "This game is 90% half mental"?