at the last link at the top of the forum. It list the many (not all) of manuals for the varoius movements timex used.
Is it easy to replace a movement? can't give a quick anwser to that. Just that all the repairs will get easier for you with practice. Get a few scrap watches to start.
Remove a case back, then the crown and stem, see if the movment comes out the front or back. Pop a crystal out than figure how to get it back in. pull the hands off and try to line them up again.
Did you serch the wikkibooks site yet?