Is replacing the stub out under the bathroom sink a diy project?

Question

When replacing the tailpiece to the p trap, the p trap disconnected from the crumbling stub out. Can I replace the stub out myself or is it something that needs a propane torch and flux?

Answer 1

If the stub-out crumbled, it's probably iron
pipe, (threaded joints).
You'd have to break into the wall not knowing just
what you'd find. There's no guarantee the replacement
would be limited to the stub-out.
Not a DIY project unless you're real familiar with
plumbing and well equipped.

Answer 2

i would go buy a rubber boot and stick on it. cheap and easy. works better than metel cause it wont rot as fast. it is probally 1 1/2"