I've been playing for a whopping 2 months (check my prior posts: got my bass for Christmas). I'd sent an e-mail to my church's worship pastor about a month ago saying "I'm a newbie bass player, and I'd love to play in one of the worship bands if you ever need me." He sent a nice, friendly response saying "Thanks, we're set for bassists right now, but I'll keep you in mind if we ever need a sub."
He called today. He needs a sub. In 18 hours.
I just got the lead sheets for the 9 (!?) songs we're doing. Of them, I know 6, and three I've never heard before. We meet tomorrow at 7:30 for about 90 minutes of rehearsal. I've got about 3 hours this afternoon to try to sort a few of these out, and maybe another hour later tonight. It figures that this would come up after a night with only 4 hours sleep, and a committment tonight.
Any tips on getting ready, other than working through the lead sheets?
Wish me luck. This is something I'd set as a goal "in the next 12 months" and here it is!

Glad I've been practicing.