My advice, take it or leave it.
1. Foil unnecessary. Others may disagree. I've never used foil.
2. Don't over trim the fat. It helps keep the meat moist and you can trim it before eating.
3. Meat temps will vary depending on the temp you are running. I've done a high heat 17 lb brisket in 7.5 hours and nailed it. I've also undercooked a 13 lb brisket cooking at 250*.
4. Time in cooler may vary. 2 hours okay. 3 hours okay. Just depends on when you want to eat and what time it is. I'd give it at least 30 minutes to rest, preferably 1 hour+.
5. I like starting around 12am and then going to sleep. I find this a good starting time because it gives you plenty of flexibility to cook until done, and hold longer in cooler if cooked sooner than expected.
6. Do NOT worry about overcooking the point. It's fatty and you are not going to over trim the fat (see number 2 above). Cook until the flat is ready (probe passes through like hot nail through butter) and let the point "come along for the ride."
Good luck.
Roger, JeffB hit the nail on the head. As a fellow Texan, I think all 6 items he mentions is on point. I just usually start mine about 5:00am though, and it ever actually stalled, we'd miss dinner. When using a stickburner, as I always have, I've never had the luxury of starting a cook and then going to bed...as it has to be monitored and watched constantly, and I have to add wood at least every 45 minutes. I usually smoke a packer brisket between 275*-290* on my stickburner. I've joined this site because I'd like to do an overnight cook, so I ordered a 22.5 WSM last weekend...and am looking forward to trying it. And, I will try a brisket on a new WSM soon...so, I can't really speak for that at this time. But, like JeffB says, my brisket is normally ready in 7-8 hours...sitting at around 200*-203* internal. At this point, I take it off the smoker, wrap it in foil, and a towel, then put it in an ice chest to rest for 3-4 hours...just whenever the rest of dinner is ready. Normally, I try to take it off at 200* internal, because the temp will continue rising for a while after you remove it from heat. Even at a 4 hour rest, it will still be very hot, requiring gloves, when you go to slice it. Sometimes, during the cook, I don't wrap at all, sometimes I wrap in foil (what they call the Texas crutch), and sometimes I wrap in butcher paper. I see very little difference in the three ways I've smoked it. Without wrapping has a little crispier bark, and wrapping in butcher paper has a crispier bark than wrapping in foil. And, at that temp and above, whether you wrap or not, most of the time it will go right on through "the stall". If I do wrap, I'll do it at about 160*internal...as between 160*-170* is where the stall will come in to play. I've seen friends trying to smoke a brisket at 225*, which is fine...but, I've also seen them hit the stall for 7-8 hours...you just never know when it does hit the stall. I always tell them, if you're between 160*-170* internal, sitting at the same temp for 30-45 minutes, take it off and wrap it in foil, crank your smoker temp up to 275* and let it get past 175* internal. Then, you can either drop your smoker back down to 225*, or just leave it at 275*...and it will sail right on through to 200*. If you can get to 170* without it stalling, it will sail right on through . I also believe in only Kosher salt and course ground black pepper for a rub...that's the Central Texas flavor profile that I like personally. Most people will say one part salt to one part pepper...but I like to go one part salt to two-three parts pepper.
Here's the last one I smoked, for New Year's. That's why I'm ready to do another one.
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It was very tender and juicy. You can see below some pieces from the point, which is what I like.
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