Pondering whether or not it'd be worthwhile developing my own B/W - but everything I've read seems aimed at people with more darkroom knowledge than I have (which is precisely none), so please humour me with some basic questions.

1) What's the absolute minimum of gear I need to develop my own B/W films? (I'm guessing: dark place to put film into a reel/developing tank, said reel and tank, chemicals, water, thermometer, clips to hang up film when developed)

2) Is the water/chemical temperature really important? (I've a funny set of taps here, either stone cold or boiling)

3) How many films will it probably take before I get it right? (because if I get it wrong, the pics will be next to unuseable, right?)