Cosmetology school/anxiety

So next month I start cosmetology school to learn how to do nails, I graduated high school last year and I was going to be a Vet assistant but there is no programs for that where I live and cosmetology was always my plan B but now that the time is here I am getting so anxious about it. I know it’s just nails and a lot of people do it not thinking they were going to but I’m just scared of failing and my parents they do not believe I can do it it took me so long to convince them to let me. I worry about getting shapes right length not knowing what to do/expect. What if I fail and my mom wasted money for nothing 😣 I try looking at videos and stuff on Pinterest and then I’m like can I really do all that?