Matthew, it's not as difficult as it seems. If you mix the chemistry following directions being precise about quantities and use the correct times and temperatures, there should be little reason for tweaking the process. C-41 and E-6 are pretty exact in their requirements. I would recommend distilled water for all chemistry to avoid all the unknown stuff in tap water. But this is vital... FOLLOW DIRECTIONS! Your first try should be as good as your hundredth. Mine was.

Paul