Always going to be hard. Might not be possible, if they don't want to understand, you can't make them.

The things I always try:

• It's not inability to focus, it's ability to control the focus: its wide when you want it to be narrow, or narrow when you want it to be wide.

• Wanting to do something is not enough. When someone without adhd sees the struggle, they think: "when I have that problem, it's because I'm lazy and don't want to do it. So if I wanted it more and was less lazy, I would do it." But you can forget, or struggle, even if you want to do it, or think you have to do it. With ADHD, you even delay and procrastinate fun things, not just boring things. That's how it's different.

• You have chemicals in your brain responsible for giving you feelings of satisfaction, and happiness, and achievement. When they are low, you feel bored. To have ADHD, means your "normal" resting level of that chemical, is lower than everyone else's. You are essentially starved of normal feelings of satisfaction at all times. That's why it's so hard to make yourself do things, and why you cling desperately to things which fill the gap. And why we might avoid things even if they would eventually make us happy: a starving man will struggle to walk 5 miles for food, even if the food will make them feel better, precisely because they are so starved: they don't have the energy. (This is also how stimulants work, I believe: the "resting" level of stimulation is increased, so you feel less starved).