Never let up on the 'business means business' philosophy and you'll do great.
Rehearsal means just what it says and more... .. show up on time, play extraoridinarilly well and get on with the other members of the band.
You have to live with these guys for months on the road, so not only must the other members play well and have amazing instincts.... they have to be able to interact with you and your family for a long basis of time.