trim the large parts of fat away put your rub on and put it on your smoker ( I use a water smoker at 250*) then start drinking the beer while watching the fire, when the six pack is done take the meat out and eat
Someone mentioned French Dip. Best is Brennan and Carr in Brooklyn.
I found a ready to cook corned beef at Sams Club. It’s the brisket with pickling spice. Three hours in boiling water. Delish.
Brisket is cooked two different ways. The Texas way and the NYC way. Everything else is a poor imitation.