Yep, your ready, provided you atleast have a clue as to how to heal and i will assume you do seeing as you have the sense atleast to check and be sure if you are ready or not
The transition from normal to heroics at level 80 is MUCH easier than it was at 70. Your more than ready to start healing heroics, although you being ready does not always guarantee a smooth run, the rest of your group also needs to be ready