actually a basic bottom end rebuild is a very simple thing.
assuming you get a machine shop to check and hone the block, and check the crank, the rest is pretty easy. the trick is in cleaning it properly as said above, and not trusting the machine shop. At a minimum you need to use plastiguage to check nothing silly has happened with clearances.
From there you the only specialist tools are a good torque wrench and maybe an angle gauge. stretch gauge as well for the rod bolts if you want to be very serious.
I've built a heap of bottom ends and have no mechanical background....and it is easy enough. I've never made a mistake that caused a failure, just double or tripple check everything before you put it together.
BTW i don't see how any bottom end is much easier or much harder to work with. heads maybe but not bottom end.