This requires at least 4-5 hours of work time, especially the AC Compressor-clutch, struts, and engine-trans. seal/gasket.
If you want the car, badly, then go ahead and buy it, but it will require some $$$ to buy parts and work on.
Your biggest concern should be the Engine-Transmission gasket, which is easier to do with the proper tools.
If you have serious problems like this, I would suggest dropping the price down at least $2-3k or ask them to fix all of the problems.