If you're going to the knife supply places (Jantz, Texas Knife, etc) 5160 is pretty hard to mess up. It only comes in 1/4" thick stock though, so if your interest is in stock removal instead of forging I'd recommend against it. Next up on the "ease of use" IMO is 1080. The heat treatment on that is fairly easy too, as is O1. 1095 can be a bit finicky if you're not careful (or are inexperienced) with hardening.