Hi! You do realize your handle will be an inside joke, when you make your 1000th post as an expert in 10 years?
You don't need a controller. I'm always amazed how I can hit a target temperature first time I check, after lots of experience. It can wait, and you'll never learn if you don't try not using one. But you want a controller. If you do something that found the money for a 42, your idea of recreation is probably also doing seven things at once. (Today I have estrattu working from 40 lbs of Santa Cruz dry farmed Early Girl tomatoes (in a dehydrator I build myself), and a 22 quart stock pot filled to the brim with chicken stock, and I should really be lighting a fire for pheasant rather than answering you.)
When you're doing seven things at once, a controller is welcome.