Manual is a good idea, but let me throw this out there also.
Can you find anybody who you have ridden with, or a friend of a friend that has some experience, who will go through a top-end rebuild with you?
The last bike I sold, (CR125) I told the guy that when he was ready to do the top-end to bring it to my garage and I would do it with him, so he might be able to do the next one himself.
It is very important to be brutally honest here about assessing your mechanical abilities. There are some people who should be prohibitted by law from owning tools.....LOL!
If you don't fall into that category, find someone to help you though this and good luck!