The most difficult thing I had to overcome is the mind set that I belong where I am. To back that up a little I raced BMX as a kid and there was a progression to the classification (beginner, intermediate, expert). I experiecned the same thing with RC car racing, with novice ane then moving up eventuly to expert. However, there is no such progression in karts. Everyone is catagorized by age for the most part.
So how this played out in karts, I would back out early or not get to close to another kart. It took me a season or two before I felt I belonged where I was racing hard and fighting for my position on track. I don’t think everyone experiences that and probably to some degree just the opposite will happen with some drivers but I struggled with that mindset.
So my advice… you have a kart, you paid your entry fee, go for it and give it all you got. If you do get the blue flag yeild the corner but you don’t have to roll over and play dead. TAG can be especially competitive and things happen fast but for the most part run your own race but stay predicatable in your where you place the kart. Don’t be afraid to ask other drivers for input and help, most people will be honest and upfront with you.
As for the karts, make sure everything is mechanicaly correct and things are tight. You will find things loosen so make sure to check fasteners throughout the race day. Do you have to go through tech before racing? If you do, you might want to see if someone can tech your karts before race day just to make sure there are no issues that would prevent you from racing as planned.
Good luck and have fun.