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There are plenty of these online and since a majority of them are downloadable for free, I guess someone looking to treat their room might easily get confused. Is it easy for anyone to use these plans for acoustic treatment without seeking professional help?
I don't know about easy, but it would be doable. The corner traps especially look easy to install. For the best ideas and workable plans though, go to a site dedicated to this. Pinterest, for instance, would not be by go-to source.