Here's the PDF file for the manual
For the clutch, simple instructions are:
Remove clutch cable from engine
Drain case by removing bottom screw on cover and top plastic (or bakelight) breather cap.
Remove 6 bolts and pull of cover. Try to save the gasket.
Remove big lock ring with screwdriver that holds starter clutch.
Remove starter clutch plate, spring, and spring cup.
There's the clutch.
To remove, you need a puller.
Use puller to pop clutch off. An impact gun on the puller works best, and it comes off with a big "pop!" That sounds like you broke it. But you didn't. It's just a scary noise.
Trying to remove it with anything but the screw in puller will usually damage and/or destroy the clutch.
The clutch bell is held on by a snap ring.
Take that off, and the bell should slide right off, revealing a brass bushing.
Bushing is usually stuck, but will slide off with a little effort. Try not to gouge it up if reusing.