I did my teaching when I had only been in the hobby a couple of years. I wasn't very patient back then in my 20's. I wasn't really interested in teacahing either. I'm just the guy that everyone pointed at when someone new showed up at the field. I was the one with the most experience. In fact, everyone there learned from me. It all started because I wanted someone to fly with. The next thing you know, I couldn't even fly my own airplanes, which at this point were starting to be nice.
Why me ? Well, I guess I kept it light. I promised them they wouldn't crash. I assured them nothing would go wrong. They felt safe. Keep it light. Joke with them. Make it fun. Don't let them get too tired. For some reason, that I can't exactly remember, they seem to think they are working their butts off. Give them a break now and them to let them catch their breath. But at the same time, you do need to push them a little. They have their limits. And beyond those limits, they get uncomfortable. So discuss the goal you expect from them before the flight. For expample: " I want you to fly right down the centerline of the runway. You don't have to decend, just work on lining up with the runway". Then concentrate on that one goal. They get a sense of accomplishment, and you get one step closer to being rid of them. (kidding)(sorta).
Its kind of important to get at least two days a week in. They seem to forget alot in a week. If you only fly one day a week with them, you will tend to cover the same ground over and over. But fly two days with them and you can review old lessons and then move on to new ones.
Expect to be emotionally invested in their success. Some of my best friends now are people I taught 20 years ago. Most don't even fly models anymore. But they feel like I gave them something special. And now great friendships have been built on being
generous with each other.

PS. Make them fly figure 8's. Otherwise , later on ,you can't get them to turn right with a gum pointed at them.

PSS. That handle on the top of the Transmitter is for yanking that box out of their hands. Stand on the left. Grab the handle with your left hand as your right hand goes for the gimble. You can't always wait for them to figure out they are about to spin into that tree! You will know it long before they will. And you know how much room it takes to recover, they don't.

PilotFighter brings up a really good point. Watch what your student's performance does over the course of the flight. It's typical for a pilot's brain to turn to mush about about the 12min mark, and they start to make a lot of mistakes doing things they did perfectly well for the first bit.

However, it varies wildly. I have one student now who takes the first 3-4min of the flight to settle down, he's so keyed up that he's not really learning anything until at least 5min in, and he usually is best up to nearly 20min.

Anyway, knowing when to break off and land to give the student a break is useful. It helps keep the frustration level down and builds confidence.

On another topic, sometimes you have to hold a student back because they think they are ready to land or do whatever when they aren't. And sometimes you have to push them forward because they clearly have the skills, but are worried and lacking in confidence in their abilities. Controlling the pace and making sure they don't stagnate or get ahead of themselves is important but hard to judge.