A couple of thoughts… the Director of Photography doesn't have to be the operator, so there's no reason why you couldn't have a DoP to handle lighting, filtration, exposure etc. while you're directing the actors and then you take his position at the camera during a take. Secondly - if you're set on being Director and DoP (and I can see why you want to), don't underestimate the usefulness of a good gaffer. Even if you have your lighting plan down to the last inch, having someone to coordinate the logistics of moving, setting up and breaking down equipment (while keeping to a schedule) will be invaluable, and allow you more time to work with the actors.