So I'd like to start developing my own 4x5 color negative sheets at home in the bathroom. My only concern would be maintaining a precise temperature for this. I'm not looking to drop a bunch of money for a processing sink, I'd prefer to use the sink or the bath tub for this. My whole reason for doing this is because it's too expensive mailing in my film to get processed on top of scanning and printing and the price of the film itself, besides it would be neat to do the creative process on my own. Does anyone have any advice on how I can be sure to keep the right temperature for developing? Thank you.