I turned down a scholarship to Yale. The problem with college is that there's a tendency to mistake preparation for productivity. You can prepare all you want, but if you never roll the dice you'll never be successful.
On record dates like that I never felt too nervous because everything was really overdubbed. When we did that album, we were in the studio for probably a week, so you had a lot of opportunity to fix things.
I hope that posterity will judge me kindly, not only as to the things which I have explained, but also to those which I have intentionally omitted so as to leave to others the pleasure of discovery.