So recently I tried the tanking route for the first time ever. I was spectacularly bad at it. I healed in Wrath and Cata so I figured I'd go back to doing that because I actually enjoyed it, problem is that my resto set is pretty damn bad. Limiting myself strictly to reg/heroic dungeons until I can accumulate better gear... how bad is it to use pvp gear to augment my set in the meantime?