I did it, and learnt so much! A whole group of us would work for this chain-smoking, suntanned older lady, just for the sheer love of it.
Staring as a paying customer, my first lesson cost 75p. I fell off when she made me trot without stirrups after10 minutes. The pony was called Biscuit, a proper dun with a dorsal stripe and a hogged mane, nice and round, but I still bit the dust.
After a while I graduated to "working" - aged probably 12/13, which the highlight was riding and leading bareback, right through the village and up to the Moors, where they were turned out - unless riding Queenie, who was old, and went up another hill to a private address, and we used a saddle for her. I would ride and lead my two favourite mares, and when the verge was wide enough, we would have a canter; they were always still up for it even after a day in the School.
Another of my lovely mares slipped and fell into s small gorge on the Moors, and was found alive but with a broken back the next morning. They brought her down in a lorry but i was not allowed to assist with her. She had been a great teacher to me, even though I made a bad job in the Working Hunter class with her at my first show.
In the end though, everyone was better off than me, and they all one way or another, ended up with their own ponies or horses - and the feeling of being a Hanger-On and not being able to progress (I was 14!) and I regretfully "quit".
Of course, so many years later, and I have had such varied and valuable experience, including my own horses, and responsibility for all types, from rescue Shetlands and Dartmoor, to fantastic racehorses, and one or two Grand Prix dressage. I ran a yard for a while, where my own and daughter's horses were, and ended up in the position of my old role model with the pony-mad girls wanting to hang out and learn what they could (nothing for them to ride though - full of big hunters and ex-racers....)..... BUT I could see so many dangers, and knew that the parents of my little fan club would come after me if anything happened. I tried to encourage insurance, but most of them were too young anyway, or parents didn't want to pay out.
And of course, when younger, I imagined myself to be Dora from Follyfoot (I was certainly moody enough).