Elizabeth makes some great comments. Go slow, one object at a time so you can sense the change. As to the WAF 'canvases on the wall', best to try some ceiling to floor lined drapes in key spots. If you pull the drapes out from the wall two inches, things like echo busters etc. can be mounted behind them so all that is seen is the drapes. JC Penney makes some great look drapes that are very inexpensive. Hey, you could even use that hideous foam carpet padding on the walls, covered by the drapes.
Also, measure the sound in your room, step by step. There are some great free software programs that can be used so you can 'see what your hearing'.
Also, measure the sound in your room, step by step. There are some great free software programs that can be used so you can 'see what your hearing'.