Absolutely, record and note everything you do when preparing a mixture, or when you use a special treatment method, etc. How else can you remember everything? What if you come up with a favorite blend of your own making, and want to duplicate it? Think how awful you'd feel if you couldn't remember exactly what you did, and what tobaccos were used..... The extra time you take to write down detailed notes might save your from a lot of grief and bitter tears in your future years. It's worth the trouble, especially if you blend up something that's unique, and you want to mix it up again 5 years down the road.
Any mixtures that I concoct are written down in a note book. I'm a hobbyist, but I came up with a few nice mixtures that I regularly smoke. I'm glad I wrote all the ingredients down in my notebook. I note all the tobaccos, commercial names, their specific brands, types, cuts, exact volumes measures/weights/amounts, my storing methods, how long a blend is aged, etc. Ever try making a chocolate cake without a recipe?
Share some of your mixtures with your friends for their critiques. It's fun.
Frank
NYC