I did a headgasket repair on just as much.

The complex stuff is really for particular jobs like removing pullys, and pushing bushings in or out. Simple jobs by the looks of it, that require just a little more force to do than the average home shop can manage without being too crafty.

You can do complete engine repairs if you have the space, a few tools, and more importantly the time to get it done.

But capitalism prevents us from being able to upkeep the tools we need to participate. Just another contradiction in the system