It's Okay to be Unsure

Most of the time it's okay to be unsure. You can say "I don't know" and everything will be fine. Don't be afraid to say don't know (I know plenty of people that are). Life is about learning and experiencing. And most of the time, you'll find someone (commonly family or friends) that will help or give advice without any compensation required; they've probably gone through something similar. It's much better for someone to know that you don't know something than them assuming that you do and have it result in something negatively.

And if you don't think something and no one is around, you can easily assess the Internet which probably can aid you in majority of various things. Use the resources you have available to discover solutions, whether that be people or the Internet.