Acme,
Sorry your having so much trouble with Taurus.
I'd suggest that you trade it in on something comparable, like a Kel-Tec P11. At this point, nothing Taurus does will make up for all the problems you've had, so get rid of the problem, and don't look back.
I've shot the P11, and it has a lighter and shorter trigger pull by far. Nice little guns, and less expensive than Taurus, with excellent customer service.
Keep in mind, that these guns are not top of the line firearms, so don't expect to put tens of thousands of rounds through one with no maintenance. They are cheap, and they break or wear out, just like anything else mechanical.
The old adage "you get what you pay for" is not far from home with firearms.
Good luck!
Kentucky,
I've not found the Taurus all that difficult to reassemble, but you must hold the barrel in it's forward most position, when installing the slide. Sometimes inverting the gun while replacing the slide helps locate the barrel properly. If it slips rearward, or the chamber end drops downward toward the frame at all, you will not be able to get the slide on the frame, so start over.
Another trick I've found is using a toothpick to depress the take down lever retention spring, so the lever can be pushed back into the frame and locked. My lever does not slide over it's retention spring as intended, with out excessive force!
Tell your friend to trade that Taurus in on something he will enjoy shooting. It's doing no one any good sitting in a drawer unused!
Bill