What to do with a unique map before using it?

for non-self-found players:

play the map you like
sell all others

for a self found as you:

CLEAR your inventory of all junk. bring 40+ scrolls (or more) as youll find A LOT of rares. and have fun

boss of this map IS DANGEROUS. research on yt before attempting (be sure that you are watching NEW version of the boss fight!)