I'm saving this in my email so I don't forget! Thank you. So, basically, we are just noting the meter reading immediately before and after fill, and adjust for any water usage, correct? (I can't find the original instructions.)
Yep. Use your phone to take a pic of the meter, makes it easy to keep track. Find the meter now so you know where it is, and clean it if need be. They can be muddied up.
You can simplify the math if you limit use, not just account for it. Turn off your irrigation system. Minimize flushes and showers. Hold off on laundry and the dishwasher. Etc.
Typically the optimum water level is halfway up the skimmer opening. That can be hard to determine when there is water in the opening (due to reflection and refraction), and even harder at night, in case that just happens to be when the pool reaches full. So mark the halfway point with a piece of duct tape so that you can easily see when the water gets there.
Once the fill starts, don't stop it for any reason until it's full. Any delay can leave a water ring stain on your new finish where you pause.
You might zip-tie a sock on the end of the hose to keep the metal end from bouncing around on the finish. Be sure the hose end stays under water, and get it underwater asap. Don't let any water run down the sides, that too can leave a stain.
Don't walk on the new finish. Don't heat the water for a month. Don't add salt for a month. Discuss your startup plan with the PB and make sure everybody's roles are clear. Even if he takes responsibility for the startup, have your TFP-recommened test kit ready and test the water every day to make sure the chemistry meets the startup plan specs. No one will care about this important period as much as you will. The better your startup, the longer your finish will last, and the better it will look.
Buy your test kit now if you don't already have it. Test your fill water. Those are good numbers to know and have, and will give you a little practice. Don't test your fill water for CYA, there won't be any.
Good luck!