An engine swap really isn't as big a deal as it may seem. And if your friend has an engine hoist it will be even easier. (i just pulled the engine on my Miata without a hoist. -No biggie.)
Get a good used engine.
Get a repair manual that describes the operation. (Haynes or whatever)
Buy whatever stuff you may want to replace while the engine is out. (Engine mounts, cooling hoses, vacuum hoses...)
Get a friend (preferrably one with a little mechanical skills) to assist you.
You could swap the engine in less than a day, but plan on using a whole weekend since things like this always takes more time than planned for.
When you are done and everything works, you will not only have a lot more knowledge about how your car works, but you will also have a great feeling of accomplishment . -Hard to explain but you will know what i mean when you get there.
Never criticize someone until you've walked a mile in his shoes. That way, when you do, you're a mile away -and you have his shoes!
'86 300E optically converted to '95 E300 (Sold)
-Blauschwarz on silver
-17" AMG & 15" AMG for winter