Not throw a wrench it this thread, I used pex in my house for a full basement repipe, copper pipe froze because previous owner didn't know what they were doing would have cost a fortune to repipe in copper, I used the copper crimp ring method and brass fittings my crimp tools came from a co called mil3 I researched the tools and they had been around for a long time and they repair their tools about 80 bucks each
For each size it was pretty easy you have to support it at every joist , at least I did.
I just put a laundry on the 1st fl and used it again, this time I used plastic fittings on the advice of another plumber who installed lots of pex he uses brass fitting on heating systems that's my 2 cents