If you're 11 or 12

If watching someone for a whole week sounds like too much, do 30 minutes.

Pick the person. Sit in the room while they do something they do every day. Homework. Video games. Getting ready in the morning. Texting their friends.

Have your notes app open. Watch for 30 minutes. Write down anything that makes them slow down, swear quietly, switch between apps, or sigh.

If you get 5 notes in 30 minutes, that's enough. You don't need a whole week.