Way to go, Quaffer! Go big or go home, I always say! If you're gonna test drive a Lamborghini, why take it through the school zones at 25 mph? lol. I like the way you think! By choosing one of the hardest meats to smoke - and get tender results, you've gained the confidence in our sweet little #1! It's smooth sailing from here!
You'll find, with the #1, you'll have to cut the brisket in two to do a full 10 or 11 lb packer. No worries, though. Put the larger half on the bottom, and the thinner "flat" cut on the top, and they'll come out great. You picked a good method (Texas crutch). Lots of good brisket rubs on here, so be adventurous!
Welcome to the club, and enjoy your new friend!