the swaps aren't that complicated, if you have any mechanical knowledge. There are lots of write ups on how to do the swap. If you've got a decent tool box, you ought to be able to do it yourself. As for the suspension, depending on what you're doing, you can do most of it with a 14, 17, a jack and stands. there are lots of write up on how to do most of that too.
start your search at the popular 240 sites (240sxforums.com/240sx.org/nicoclub.com) they have most of the info you need. from there, you'll know what you will need help with.