CONGRADS ON THE FEED!
I knew you would be ok, you asked a lot of the right questions and I think you got all of the info you needed before. Glad to see another person thinking ahead and being successful because of it.
**As for the mouse being wet and needing to dry it...
Personally, when I get my feeders I separate them into individual bags. I keep a small tupperware container with a lid maybe 4" square and 3" deep (ish) with "Snake" written on it. I fill with water approx 100 F and then drop in the ziplock bag and close the tupperware container while pushing all the air out.
Patience is key with snakes. You can leave that feeder in the enclosure for an hour no problem.
Always glad to read these posts!
Good luck in the future and remember, don't sweat the feeding patterns of a Ball Python as there is no pattern :p