Tank you very much!

So, I decided to dive into the wide world of tanking.
First problem; GEAR.
I am, as I write this, sitting at 460 defense and 18k health.
Waaaaaaaaiiiittttt…
I was at 20k with PvP gear, but I learned (The hard way) that early tank items have their budget eaten by defense. I have half a tank set and no tank spec, so hold back on the “WHOMG SCRUBKNIGHT!”. I have recently tanked H VH (Well, xevozz anyway) with 400 defense, and a Druid healer (Meaning no spike heals). So I realized; “Hey, I’m not bad at this!”
All I’m trying to say is; Try tanking. If you become known, even just in your guild, as a good tank, you’ll have groups with no trouble. If you become known as a bad tank… Well, not so much. Work on it though, and if your guild doesn’t at least give you a chance to try again, even in a heroic or 80 normal, look for a new guild. Especially if it’s just because you’re a DK.
UPDATE: Now at 20400 hp in frost presence, and 545 defense. Yay!