I did it! (Destiny)
I apologize for the brag.
I know many have done it before (and on a harder difficulty) but it felt like an accomplishment to me. North and I worked out how to get to Crota on Hard Mode, but I'd never really thought the final battle was possible for my level of skill. So I decided to go to Normal mode to train. After many attempts and quite a long time learning how not to do it, I was finally able to get a rhythm that worked for me.
Now comes the hard part: figuring out how to do this on hard.