I just finished replacing my chain, chainrings and cogset. I actually had fun doing this, even with the mistakes I made and had to correct (several times). Up until now the most I had ever done was very basic maintenance. Expect to be w/o your bike for awhile and to have to do things several times before you get it right. I had a bike stand, basic set of Park tools and a friend who lives close by that knows a lot more than I do (priceless!). I also had both books mentioned earlier books and many torn out pages from Bicycling magazine.