Depending on the cleanliness of the enclosure, I wouldn't clean it until he has been in your place for about a week unless it's really in need of a cleaning. This way, he/she has all his 'normal' things right where he left them, with only a different view out of the front of the tank.
It's not a big deal either way, it's just something you could do that would possibly reduce the stress.
Other than that, everything sounds like you have most under control. Be sure to check out the Ball-Python-(Python-regius)-Caresheet if you haven't already. Congrats on your new friend and WELCOME to BP.net =)