You should be fine to go in, assuming you have a group that knows what they're doing. With proper CC, a decent healer, and you doing your job properly you should be alright for the easier heroics. Froman gave good stats, but benchmark stats are just that, only a benchmark. It's not an exact science. For example, when I started playing again recently, I had a lot of old friends who wanted me to run with them again. As a result, I was pulled into heroics a lot sooner than you ordinarily would be. I was tanking H Mech, H Sethekk, and H SP them with little over 10k HP unbuffed. I made it, but it took careful CC, a competant healer, as well as my knowing how to play my class pretty damn well. I specced into imp. revenge for a short time so that I could have to stun to reduce damage on me, I would use abilities like concussion blow and disarm religiously. I had to go out of my way to think through pulls creatively in terms of how to tank them again.
It was definitely fun. I've been tanking long enough that while I wouldn't say it gets boring, sometimes it begins to feel routine. I'm good at what I do, people I run with know I'm good at what I do, and by this point in time I don't even think about a lot of it. I just do it, and it happens like it should. Not only is this no fun, but it also makes for a crappy tank. If everything is always routine, you lose your edge, and you forget HOW to do what you need to be able to do, when the **** hits the fan. It breathed a lot of fresh air into tanking for me, honestly. Go for it. The worst you're going to discover is that you can't tank them right now after all, and you have to pay a repair bill. It's not the end of the world. If you plan on having any sort of progression, you'd better get used to paying repairs anyways.