Stupid Car! HELP!

I’ve been trying to avoid this. I’ve read some tutorials online that tell me how to do this, but I’m worried I might f^&% something up. Mostly because I don’t understand the instructions 100%. Is it expensive to have a shop check the codes? Or could someone / does anyone know someone on the forums that could come help do this? I’d like to learn properly how to read them, whether I bring it to a shop or not. I would just prefer to KNOW I’m doing it right, rather then guess based on what the tutorial says.

Thanks again!