Lip balms were my first products.
But, being a teen, I was busy with everything at once, so I dabbled. My teachers were books I could find on the subject. Even though this was a time of hippies and 'going natural', none of my friends seemed all that keen on DIY cosmetics, so it was a solo thing.
Just as I was beginning to get serious about emulsions, I packed up and moved across the planet....
All this came up while I was answering these interview questions for Wheels For Women about my first car memory.