I was a dog trainer for years, where I primarily taught owners how to train their dkgs, then managed a grooming salon where I taught new employees how to bathe and do basic grooming.

My recommendation is to get a beginner book of whatever you're teaching or write down the fundamentals so a) you don't miss any of the important foundation information and b)so you can teach in a cohesive way that builds on itself.

Foundation is the most important thing for learning new skills, and you want to make sure your trainee gets a really solid one before moving on to more technical aspects.