Air for dusting prints, or a gentle brush. Timer. Good trimmer. Shot bags/drafting weights for holding a positioned print on the board while you tack it. Rulers/t-square or a jig for positioning and centering. Something flat and heavy for pressing down on the mounted print as it cools down. Maybe a stamp. Have a read of the mounting section in "The Print" by AA.
I don't use release paper. I use two mats above and one below, prints never stick to the above boards, as long as they've been predried, and so has to be the mat board.
Enjoy the perfect look.