How easy/difficult is it to cut threads into 3/4 pipe that is in the ground? I've dug around the pipes and have room to work. I want to cut a section out of the pipe, thread the end, and screw a cap onto it. Is this fairly easy to do while the pipe is in a hole in the ground? Or is this way too much trouble, and maybe I need to think of some other way to do this? The pipes are old - they have probably been in the ground for decades, and are rusty, so I'm not even sure I could clean them up enough to be able to thread them. I'm also not sure I could unscrew them from the various fittings, they are so old and rusty - I'm not sure what would happen if I tried to unscrew a section of pipe from a tee, it is so old, and one mistake and I have no water until I get it fixed right.
So having said all this - is it practical to thread 3/4 water pipes (iron I'm guessing) that are in a hole in the ground?