Answer:
are committing the planning fallacy
Step-by-step explanation:
You overestimate things and your brain thinks out a thought out plan when in reality it's a lot harder because you aren't prepared. One assignment can seen or be easy to you in your head but it turns out that it's not because you take so much time thinking that it's easy but when you actually do it, it gets harder by every second you think the plan in your head.