My first insulin pen was more confusing than I expected

I recently started learning how to use an insulin pen and realized there are many small steps involved.

Things like attaching the needle, checking the pen, selecting the dose, injecting correctly, and storing supplies seem simple once you know them, but they can feel overwhelming in the beginning.

For people who have been using insulin pens for a while, what helped you learn the correct technique? Were there any mistakes you made early on that you wish someone had explained?

I'm looking for practical tips that make the daily routine easier.