The Rubber Band Trick - If you need to remove a nail, criss-cross a couple of rubber bands over the top of the hammer before using the hammer's claw. The rubber bands will protect the surface that you're removing the nail from.
Can't believe that I haven't seen this fix before. Had to repin for future reference. -- Fixing a stripped hole with a golf tee: 1. Put wood glue in the hole 2. Hammer golf tee into hole 3. Use box cutter to cut off excess tee 4. Drill pilot hole and screw new screw directly into the tee!
Lay out your gallery arrangement. Flip frames over. Mark hanger/nail spot on several pieces of wax paper taped together. Flip waxed paper over, tape to wall, nail into wall where indicated. Remove waxed paper. Hang photos.