One suggestion, if you do get a plumber to do the job ask him to put in a metal valve with long handle. This type of handle is so easy to turn. The main water valve may never be touched but if a leak happens and one needs to close it in a hurry you only hope that it isn't frozen in place. That did happen to me, fortunately I had a wrench right there that allowed me to close it. I replaced it with something that will not jam.
