First kiss tips

I’m 17 and a smidge late to this whole romantic relationship thing( also a lesbian and not out yet making it a tad difficult)but anyways I’ve been going on a few dates with this girl who I know is into me she made the first move asking me out, on our third date she asked if she could kiss me but I freaked out not gonna lie and did the most awkward thing and just kissed her cheek (AHHH I HATE MYSELF) anywho on our fourth date I was pumping myself up to kiss her and then I backed out. Do you guys have any tips on how I should approach this?? Or just anything you wish someone had told you before your first kiss?