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The reviews I read didn't say it was hard, they only complained that it takes to long and that you may have to repeat it several times for example if you change something in your room.

But the biggest problem is obviously the space problem. Sure, people who have 12 feet of space between their TV and the couch and have perfect lighting conditions etc. will have no problems at all, but it seems that the vast majority of people just isn't that lucky. These people will have to rearrange their furniture, change the lighting etc. first.