Some advice from a new owner who definitely made mistakes. (also i didnt read every reply so sry if i repeat).

You mentioned you know a BP owner already. Learn husbandry BEFORE you get your snake. Have your cage setup before you get the snake. Make sure you have everything you will need on hand so you arent scrambling to get things u didnt know about like i did.
I made many mistakes starting from buying the day i got the urge. I didnt ask any proper questions at the pet store and didnt get any info on husbandry when they sold it to me. I couldnt get him to eat for almost 3 weeks because i handled him far to much, not enough hides, and no humidity control at all. after 2 weeks and repeated visits to the pet store i started getting and reading books and forums. Hes eating very well now, has a nice enclosure with proper husbandry. I hope at the very least you get a book and read up or talk to current owners and get a very detailed idea of what your in for. I wish you the best of luck and hope you dont make my mistakes.