>>771999Find a friend that rides/races, see if they'll help you go through an engine.
Also get yourself a service manual for the bike. That'll walk you through disassembly/reassembly, although there's a lot of shortcuts the manual doesn't cover, and that's where having a friend that's done it before helps a lot.
When I got into motorsports I didn't know much about engine mechanics. As an engineer I'm pretty good at figuring things out, but cracking open an engine is intimidating the first time you do it.
Had a friend help the first time I needed a top-end on the snowmobile (2-stroke twin), realized it wasn't all that hard to do. Same deal when I needed some work on the motorcycle (single-cyl 4-stroke), a couple tools I didn't have at the time a buddy did, so I hauled the engine up to his place and we knocked it out in an afternoon. Same deal, isn't real hard after you've done it once already.
Now I don't have any hesitation about splitting the case on a small engine.