I do brisket two ways my "Texas" style and "competition" style.
Texas style: Trim fat then rub with salt, pepper, and dry garlic liberally. Smoke fat cap down at 225 until it hits 170 the pull wrap in paper and put back on until it hits at least 201 internal temp. I don't have specific temp I pull brisket as they all seem to be a bit different but after 201 I check often more for feel then temp. I have come to tell by how easy the meat probe goes in if it's ready or not. Then let rest for at least a hour.
Competition: Trim fat then inject with a commercial mix (I like kosmos) or beef base Au jus mix and let rest in a large bag (I use crockpot liners) for a few hours. Then rub I use a commercial mix that besides salt, pepper, and garlic also has some cayenne, paprika, brown sugar, and more. Then into a foil pan and onto the smoker between 225 and 250 depending on size. Once I hit 170 or I think the meat has enough smoke on it I cover the pan with foil. I'll pull using the same method as above and also let rest at least a hour.