Earlier quoted context omitted.
I've looked into these processes years ago but backed off because they seemed to require some really stringent temperature control. Is it no longer the case?
In general I'd say the C-41 kits are relatively simple for someone who's accustomed to B+W development. It comes down to being sure the chemicals are at the proper temperature and that agitation is even. There's much less tolerance for variation compared to B+W but it's still well within the reach of a diligent amateur who focuses on reproducibility and good lab skills. The main requirement is a temperature-controlle…
I live in a relatively mild climate and B+W development usually means measure the temperature of tap water once and go with it for the day. For C-41 it's also a bit harder to keep things at 39C which makers a larger gradient against room temperature than 20C, but in the end I suppose it's not too hard with a water bath.