French kissing ;)

My BF and I were both each other’s first kiss so I’m wondering if we want to progress to French kissing, how will we know what to do? I’m already a bit grossed out by the concept bc I think saliva is nasty but assuming I could get over that, I feel like it will be a slimy mess to try to figure out how to do it if neither one of us has experience. Does it come naturally or does every couple do it different? How do you initiate or contribute to it anyways? Helpppp!