I guess it depends what your previous experience and confidence levels are. I don't have much experience but enjoy having a go at tinkering with a bike and the Park website is very useful as the previous poster says.
Some not very technical observations.... and at risk of stating the blindingly obvious I've found the following...
If you use the website, it helps to print out the pages so that you can refer to them stage by stage as you are working - or better still scrounge the Park book off a friend, preferably one who doesn't mind it being returned with oily fingermarks.
I have also used a rather ancient Haynes bike book at times as the diagrams are clearer and assume less knowledge than the Park stuff but I am pretty much a complete beginner!
Get all of the parts, bits and tools you need ready first
Put the bike on a stand if at all possible - it's much easier to work on that way, particularly when making fine adjustments.
Take the job a step at a time
Allow plenty of time and patience for adjustment
And lastly - have fun - it's a learning experience
Best of luck and apologies if this is teaching granny to suck eggs!
Carol