I wouldn't get a vest, it really doesn't hurt that much, I find pretty much all protective gear too restricting (bar a mask of course), I don't even wear gloves. Personal preference of course, play a couple of games and then decide if you want that extra protection. Getting you own mask is definitely step 1, and absolutely make sure it's thermal. If you've hired from almost any site then you'll have undoubtedly experienced the problem of it fogging up very quickly, with a thermal mask (~£40 new) you won't have that problem.