There's a big difference between when I'm Tom and when I'm Conchita. Conchita uses very proper German; Tom talks in an Austrian dialect. Conchita gets mad if she is kept waiting; Tom is lazy.
One of the coolest ways to start building a character is the way he moves his mouth, what part of the mouth he puts his words into, how he expresses himself, and there's a certain flavor you get with a dialect.
When we started on 'Power,' I was committed to respecting the differences among Spanish dialects: Dominican, Nuyorican, Mexican, etc. I wanted the language our characters spoke to be as specific as possible, to reflect New York as it is.
I did 'Christmas Carol' off and on through my teenage years, so I always had that dialect and that sound in my ear, which was so helpful. It became second nature.
I tell people, if you really want me to look that good, why don't you cough up about $2 million more and hire Alec or Billy? If you want me to do it, this is what you get.