If you have a decent set of tools, you should be able to do a true bolt-on kit in a day. Probably the most difficult part is tapping the oil pan to accept the return line, and that is relatively easy.

Lots of people do engine swaps in their garage, and it is much simplified using a cherry picker, and air tools will save you a lot of heartache.

The guys around here love hmotorsonline.com for used motors, or you could always look local.