well, I say they drop right in. they do for the first 3 seconds, then they bind, and then they're a pig to move. So you need the jig set up ready to drop the pin right in to the correct position straight away. Saves bending the rod or scuffing a piston.
Regards the rod bearings, try bolting it to the journal with the piston hanging out the bottom of the engine, and if it turns on the journal OK then you must have bent the rod.