I successfully completed this yesterday. Having never done Mac repairs myself the difficulty level made me nervous, however don't be afraid to give it a go! There are lots of little screws and parts but its not hard, more fiddly.
In addition to the tools here consider getting some kind of segmented box or little containers to keep all the screws separate. Also when I opened it up my logic board was filthy with dust! Keep a microfiber cloth and perhaps a soft brush around the clean a little as you go.