Well, I don't know much about Tankadins, but you don't look too bad gear wise. Better than I was when I started Heroics.
The following Heroics are a pain in the butt and should be avoided until you have good gear/a strong group:
Halls of Lightning
Gundrak (only the final boss really is a pain)
Old Kingdom (only the extra boss and Volaj really are tough on new H-tanks.)