I replumbed our then new to us house a couple of years ago with the help of a 70+ year old handyman and went with PEX A and a $100 manual expander tool, if I had to do it again, I would probably invest the $400 in battery powered expander tool. The manual tool is not bad for small jobs, but is hard to get into tight spaces, and needs a lot of upper body strength for 1 inch fittings, 1/2 inch is fairly easy, and 3/4 inch will wear you out if you have many to do. However 1 inch makes you worry you are going to snap the arms off the rather substantial tool.