If I was you I'd do as Gray has already said.. Basically, if your going to do it, do it once and do it properly..
Invest some time into it, give it a thorough deep clean then once it's done, have a beer and no doubt you've learnt something new when taking it all apart if your not already mechanically minded and you've managed to do it on your own which is an achievement to yourself
Im going to be doing it myself in the next couple of weeks maybe if time allows me to if not then, in 5 months time when I have time off. And I'm no mechanic