Advice wanted from the handy person types:

I’m pretty good at things like doing electrical boxes, hanging drywall etc. The drain pipe and trap on our kitchen sink is shot. It’s been patched so many times. It’s basically made of glue and JB Weild. I don’t want to hire a plumber because I think I can do it myself. However the threads on the sink that connect to the drain are gummed up. Wall connection is probably fine. Sink is 70 years old and horrible.

Am I nuts?