Well, let‘s take a look at your situation. What level are your athletes or clients at? New athletes or clients probably would not benefit from percentages as much as more advanced clients, as they need to learn how to perform the lift correctly first and foremost. Second, a new client will adapt to the exercise so fast that by the next time you perform the exercise, their 1 rep max may be out of date and thus their percentages would be incorrect (if they used to bench 100lbs, but after 2 workouts they can bench 110lbs, that 60% you have them working out as now too low to cause the adaptation you are looking for).
Build a solid foundation knowledge, you will find that all the programs upgrades is quite easy for you to understand. This is because the core foundation will not change. When it comes to learning new things, you want to take it one bite at a time. Don‘t punish yourself if you can‘t get it the first time. Don‘t give up easily. If you don‘t know how to even write an email, start by just register an account. If you don‘t have a computer, start by using the computers in the public library. Be flexible with the approach but be firm with the intention when it comes to learning the new technology.