Just for fun I tried a three solution Tetinal (brand name) kit. As others have mentioned, keeping the correct temperature of the solution and keeping temps stable while in with the film in the developing tanks was very important but not overly difficult. The kits were pricey, they are good for I think around 10 rolls, store guy said some get more. biggest problem was that once mixed, the solutions have a limited shelf life so to make the most of it one would have to shoot at least 10 - 12 rolls then have the time to develop them over no more than two days, one day being better. I don't shoot colour film as a rule and if I do in future will most likely search out a reputable lab.