I think you have to find the humanity in the character and then the deterioration is a part of the process - the journey of the character. It's like playing King Lear. You can start off as a nice old man who finishes up crazy.
Well you just have to own it, I suppose. Own the character, which is difficult.
Some people would say I've made it now.
I'm becoming a frustrated director, I think, in an actor's body.
I'll never forget anything about Middle Earth. That's part of my memory now so I won't miss anything.