usually the Gun Digest books of 'assembly & disassembly' provided by the NRA have pretty good detailed ,easy to follow with pictures ,etc....find the one related to the guns you are asking about, as they usually group them by firearms 'type' ...we see these books at the gun shows ,any of the book dealers carry them , but check with the NRA, OR if you have any larger gun shops ( stores) Gander Mtn, Cabelas, etc, they usually have a gun library section...........if you are handy in taking things aparts, then just "observe" what you are doing, look into the action and try and "see" just what may or may NOT be taking place...the disassembly books help to put things in a proper order ( sequence), and any parts drawings may not be "detailed" enough to show sear notches, or engagement of them ( trigger to hammer, etc) It is not rocket science, pretty cut and dry , and for the most part, pretty 'primative' on them old single shots..as for the 22's its basically "fouling" (dirt) brings them to a screaming halt...nature of the beast. Then it is usually the ammo 'type', change brands maybe.......and of course use the proper type of ammo,standard versus high velocity ,versus 'hyper velocity, and so on..............
as I said , a GOOD cleaning is first before anything else,cause that may be alll thats needed....good luck