Every January turn all of the hangers in your closet backwards, like this. It takes about 60 seconds: Each time you wear an item, hang it back up in the normal fashion, which takes zero effort to remember or do. In June, any item that is still hanging backwards has not been worn in 6 months, donate it to Goodwill unless you can come up with a good reason to save it.
This simple trick from Better Homes & Gardens. Simply cut any paper (newspaper works great too) to the size of your framed photography and position the paper on the wall with painter’s tape until you’re satisfied with the arrangement.