I first learned astrology from my mother, who practiced it for a long time as well as did tarot readings. She showed me how to cast a chart and do tarot when I was a kid. She had all sorts of occult books that I read and was fascinated by. One in particular was about divination of various kinds. I don't remember the title, but it was an old book (perhaps from the 40s). It was stolen from me by a neighborhood girl when I was 13 who wanted to borrow it and then pretended I never lent it to her.
I learned to use playing cards as tarot from it, and used it to find out who my first lover would be when I was around 10 or 11. I remember that clearly, because the response I got was a reversed jack of spades, which meant a "destructive and conniving youth" or something similar according to the book, which caused me to throw the cards across the room and hide under my bed covers.
Strangely, six years later, I met my first lover, who was indeed a dark and manipulative young man who was very destructive to himself (Scorpio Sun conj Saturn, Mercury conjunct Uranus, Aqua Mars square Pluto to give a little indication). I had forgotten all about that incident with the cards at the time and only remembered it much later.
The cards also said that I'd marry a man whose name was one of the names of Jesus' disciples. The love of my life now indeed has such a name, and one of the less common ones, too. We do plan to marry.
My mother eventually decided that astrology conflicted with her faith, and threw out all her books, notes and charts. I saved her tarot cards and use them once in a while; I also had a set of them given to me by an old friend who passed away.
I started doing readings for my friends in my early 20s, but then stopped because it seemed to draw out the worst in some of them (like wanting to tell me what they should do with their lives, asking how to exploit potential lovers, or causing them to unleash all their repressed feelings on me in a destructive way; one person ran into the street, laid down and refused to move for 10 minutes after I spoke with him about his chart! He just kept looking at the stars and saying gibberish while I tried to get him to get out of the road
). I felt ashamed that I'd been so careless with it, and stopped practicing for a while, forgetting a lot of what I learned. I just recently picked it up again, but a bit more cautiously this time in terms of how I introduce it to others.