I'm rather handy when it comes to most projects; however, we had some problems with a bathroom sink and had a plumber come to the house to look. I was at work and couldn't make it so my wife met him at home. He said we needed to install a farrell and that he could do it for $50. My wife said that my husband was handy and could do it, but I have no freaking idea how to. I've seen the small litle buggers at Home Depot, but I haven't the clue as to where they go ... any advice?