Blackx2

So I've decided to replace my window regulator. Apparently that's the reason why I'm getting a major rattling noise when the window is down. Honda quoted me about $650 for parts and $300 for labour...before taxes. I picked up a used regulator for $50 on ebay...hopefully it works . Before trying to replace it myself I wanted to know if anyone has done this before. Any advice? Do you recommend I do it or should I save myself a possible headache and pay $300 and have it done by someone who know what he's doing? thanks guys!