I'm redoing a bathroom in a 1960's vintage home. Wanted to replace the rusted pipes draining from the sink (in the wall) with pvc. Should I screw out the pipe or just pull. Do I have to knock out the wall and get a clear view or can I do the job without wall damage. When I install the PVC do I simply align and insert where the old pipe was? Any tips on the best way to do this?

B

What are the pipes made of that you are going to replace. How long are the pieces that you are going to replace... give a little more information and maybe someone can help.

I'm going to assume that in a 60's house the pipes are galvanized iron.
This will be a simple conversion without tearing into your wall.
The wall stub out should have threads. Screw on a PVC thread to slip adapter on the threads and you can glue the PVC trap to the adapter.
Don't forget to Teflon Tape the threads and use PVC Primer on the glue joints.
Make very sure that everything lines up before you start to glue. PVC cement sets up fast. Good luck, Tom

It's galvanized iron and the threads are rusting. I can't see how far it goes into the wall but I assume it's about 6-8". I tried turning the pipe and it's stuck also. Any tricks to turn the pipe or get it unstuck?

Wire brush the threads to clean them up. Purchase a ,( I['m assuming 1 1/2 inch) female threaded compression fitting .(see image) teflon tape the pipe threads and screw it on.
You have just convered to PVC. Good luck, Tom