Those Who Can't Do, Teach
I'm walking proof of the idiom, "Those who can't do, teach." Recently I broke my foot. After trying to "walk it out," it became apparent that I was going to need medical intervention. Two hours later I was getting ready to leave Urgent Care with a temporary splint and crutches. The nurse asked if I knew how to use the crutches and I said, "Yes, I used to teach people how to use them. I've got this."
Correction, I so don't got this. It is much easier said than done, and it is nothing like riding a bike. Those motor memories just weren't there. I've never been very coordinated; but apparently what little coordination I had 15 years ago, no longer exists. My deficits aside, it is much easier to demonstrate crutch-walking when you know you can put weight on your foot if you have to. As opposed to performing crutch-walking with a splinted foot and the knowledge that waves of electric shocks will pulse into that foot if you put any weight on it.
As you are teaching others, take into account which differences exist between teacher and student. Walking with two healthy feet is not the same as walking with one injured foot. Using crutches at 25 years old is nothing like walking with crutches at 45 years old. Even if you had two 25-year olds with two healthy - or injured - feet, those two people would not be working with the same skill set. Sadly, practice does not always make perfect.
While my example is specific to the medical field, it can be generalized to any business. Until you have walked in your clients' shoes, assume you would have difficulty with every task you are trying to teach them. Be patient. Be compassionate. Be encouraging.