You tube videos are out there. Fastest is to set the sous vide to strike temp when you go to bed. Then you're ready to mash in when you wake. I now use a large hop spider for the sous vide, but in the past just used a wire cooling rack to keep the biab bag away from the recirculater. I mash in a large cooler.
It's so easy that I cant justify a RIMS or HERMS build even though they are sexier.