Jacob, I do briskets all the time so i am going to tell you how I do it. If you are unfamiliar with the anatomy of a whole brisket just get a good size flat. If you know the real deal, get a whole one and trim it to 1/4 inch fat on top. Also cut a big hunk of white fat out from in between the point and flat (both sides). When your scared your going to cut the point off completely you have cut enough. Also, I always cut the tip off the flat so i know which way to slice after its cooked. You MUST slice against the grain of the meat. If you don't you will ruin it, no matter how tender it is.
You can inject with moores marinade or Dales sauce (if you have those at your market) but for the first time I would just leave it be. Next, smear the whole thing with olive oil and cover both sides liberally with your favorite rub. Leave it sit on the counter for an hour at least to warm up. Throw it on a 225-230 smoker with hickory (light blue smoke) at all times. I only use 1 or 2 chunks at a time.
Insert a probe into the thickest part of the FLAT (do not go through the point because it reads at a different temp). I would only apply smoke during the frist 4-6 hours of cooking. briskets absorb smoke like a sponge. Much more than Butts do so it's very easy to oversmoke. Cook fat cap down (somebody's gonna yell) until the internal temp reaches 190 about 1 and 1/2 hours per pound. I don't spray it or anything but you can if you like. Remove the thing and wrap tightly with heavy duty aluminum foil. Place it in a cooler for at least 3 hours (4-5 is better). It will continue to soften and cook inside the cooler but this keeps it from drying out as opposed to you leaving it on a cooker. Now this thing will hold like this for about 7 or 8 hours and still be warm. When your ready to eat, cut the point off the flat and shred or cut it into burnt ends. next slice the flat against the grain, each peice about the width of a number 2 pencil. It will be as tender and juicy as you can get. Use the juice in the foil and pour it back over the cut slices. mmmmmm Good!!!
Lord knows I spent a lot of money screwing these up so I always love to learn new things. So far though, this is the best way I have done it yet. Godspeed!!