

This tool (above) is called a 'set and match' by Kapro and I could not hang pictures with double hangers, without it. It's a ruler with sliding nail markers, which have levels on them. It comes in 24" - 40" lengths and it's a life-saver. I bought mine at Home Depot.
The clear dots are rubber picture bumpers. I use these religiously for two reasons. First, they help keep pictures straight that are hung with a single nail, and secondly, they keep from scuffing your walls.
Some basic rules of picture hanging:
1. Don't scatter your pictures. Hang them in groups for more impact.
2. Use templates from wrapping paper of your pictures to get the positioning right before you start putting holes in the walls. It's a bit laborious, but well worth the effort.
3. Call your decorator and ask her for an hour of time if you are not sure what frames to buy or what heights and walls to hang them.
Aesthetic Addiction is an Interior Decorating blog created by Decorator and Owner of Orange Moon Interiors, Kelly Boeve, in Sarasota,Florida. This blog is dedicated to side projects, do-it-yourself decorating advice and inspiration for those who want to make their home, their sanctuary.