+hit is always a help, but not required for tanking. It smooths out bumps nicely though, as nothing's worse than a missed/parried mangle and watching the dps descend unaware (get threatmeters!).
I just have hit and expertise from my Earthwarden and my Brooch of Deftness (a great purchase for that reason) and do fine. It's best to pick it up as you find it rather than dropping tank gear.