I enjoy shooting film from time to time. I like the process, the feel, and the whole "specialness" of it. Up until somewhat recently, I was afraid to develop myself, but this video from fantastic channel Eduardo Pavez Goye shows that developing film is a lot less scary than you may think.
When developing film, especially color film, we are told that your chemicals need to be within one degree or it won't work, or that if you don't get everything absolutely bang on with the right tools, it will ruin your roll. However, in this video from Eduardo Pavez Goye, he challenges that advice by developing some rolls of film just by guessing. No measuring his chemicals, no measuring his temperature, all he measured was time (he's not a madman!).
As you can see, all those statements we hear that color development is hard and you have be totally precise are not exactly true. Your temperature can be good enough, the amount of chemicals you use can be close enough: the big thing here is your order of operations and time.
Now, if you want your results to be identical from batch of film to batch of film, you need things to be a bit more scientifically accurate, but as this video shows, if you're just playing with film and doing it simply for the fun of it, you can afford to be a bit more loosey-goosey with the formula.