lesbian sex help

I really like this girl who is aromantic and homosexual and I know she's had sex with other girls but I definitely haven't - I'm a virgin and although I have seen informational videos on lesbian sex (and its not porn), I am still completely unsure on what I'd do with myself.
I'm told I lack a lot of confidence about myself and am either afraid of getting things wrong or worry I'm doing something wrong, even if I'm doing it right. I've never made out with someone either. I might not even have a chance with this girl but I want to be prepared in case she surprises me. Any advice?