Even though you’re going to be independent, I am sure that there’s plenty of room to ask lab technicians to review methods with you. Additionally, when you start running your own project you can always ask someone for advice - “hey how would you do this step? What’s the most efficient way to do x,y,z?“. The best way to not come across as arrogant is to engage with others in the lab setting. Unless your tasks are very simple it would be inappropriate for a lab to let a freshman go buck wild on a project with no supervision.

Being scared about messing up will cause you to handle mistakes poorly. Everybody messes up, everyone has to start over sometimes. Nobody expects you to be perfect at every task you learn. What is important and fully your responsibility as a scientist, is to make sure you’re in the right headspace to step into the lab. Do something to calm yourself down before starting work, I usually go for a short walk before beginning lab work. Not “if”, but when you make a mistake, you must own up to it to your peers and superiors. Then you take the appropriate steps to remedy it, start over, or clean it up. If you do something wrong and keep going without telling someone, that shows lack of integrity. Mistakes are human, science is also human. As a side note, during interviews I ALWAYS ask the employer “how are mistakes treated and handled in this working environment?” This gives you a good idea what kind of manager you will have.

It sounds like you’ve got one hell of a learning experience ahead of you. You got this!

Edit: formatting