I plan to develop some b&w film at home. I bought a Patterson dev kit: tank, two reels which can do 120 too apparently, measuring cylinders, film clips, thermometer , squeegee for about 50 UKP. I also needed a changing bag and some chemicals, I guess this is another 60 UKP.
I have a few 35mm films on the go in various cameras and when these are finished I intend to develop them myself.
I did finish some rolls previously but it always turned out that I'd taken a few images that I considered important and ended up sending them off for processing! I guess it's a confidence thing