Take notes! Whenever you cook, keep a log, at least until your methods are instinctive. There are so many variables to master. You should be making notes on the meat, its grade, its weight, where you bought it, how you prepared it, what rubs and sauce you used, the cooker temperature, ambient air temp, the wood you used, when you added wood and how much, etc. When you are done, note what it tasted like and what needs improvement. Study the info. Put your cooking logs in a notebook. You learn a lot about the performance of your cooker and the cook when you keep a log of them.
Click here to download a free printable PDF version of my cooking log.