Low, slow, consistent temp, The mantra of southern BBQ’rs. Smoke at a steady 225* with a pan of water in the smoker to reduce the stall. Cook til 160 internal, pull it and wrap it in foil. Put back in til 200*, pull it and put in a cooler to rest at least an hour.
While smoker is warming trim the fat cap to 1/4” or less, trim all other fat and silver skin off. Rub brisket with mustard for a binder, use salt and black pepper for the seasoning. plan for 1hr per pound cook time.