A comment on "self-taught" vs. "peer teaching."
Rich Pfeiffer came to hang gliding from skydiving. His friends just took him up a big hill and sent him off on a hang glider, saying he'd figure it out on the way down. I think he broke something, like a finger, at landing. He went on to become the US National Champ in the late 1970s.
That's "self-taught."
Around the same time as Rich became champ, I bought a Seagull III and took it up to the steepest part of Hogback Creek Road at the base of Mt. Whitney. I'd only seen one hang gliding flight four years' previous. The wind was light north. I figured out how to set it up and hooked in. Shouldered it. Started to run. Felt it go light. Felt the hang strap start to lift me. Felt my feet leave the ground. Noticed the barbed wire fences on both sides of the road take on new significance. Pushed out in a panic, dropped a tip and slid to a halt, thinking, "I'd better find somebody to help me do this."
That's almost "self-taught."
"Peer teaching" is when your buddies actively engage in your training by flying around in front of you and by teaching you to take off from hills and, later, cliffs. Their incentive is to get you into the air as quickly as is safely possible so that you can all have fun in the air together.
In a single-place aircraft, "self-teaching" pretty much begins when you leave the ground, anyway. Neither I nor my "peer instructors" ever saw a need for radio instruction. They must have felt you were advancing too quickly if radio instruction was ever called for. So they just yelled. It worked just fine during the "low and slow" stage. After a while, they stopped making noise and I listened to the wind.
An apt pupil can progress very quickly in areas with favorable conditions.
Formal training is different. The certified instructor is under tremendous pressure not to have a student injured. The student is often one of many. An altruistic instructor is much like a peer. But a commercial instructor is also driven by profit. Dragging on training both serves to reinforce safety and skill - but also increases profit. Some people do better with formal instruction. Others, like me, don't.
In "peer training," pilots go to the places where conditions are best. But in formal training, a school, for instance, has to wait for good conditions to arrive at their training site. You can see why the number of good days for "peer training" is higher, and why new pilots involved in "peer training" tend to advance quicker.
A certified instructor will always make the case that formalized training is generally safer than "peer training," and this is true. But I have found that people who engage in "peer training" are more focused and driven than students in schools, and therefore advance much faster.
I was a bit puzzled by the PIO comment. Yeah, self-taught guys who learned in the early days and even new pilots today who aren't paying attention might suffer from pilot-induced oscillation. It's common to all aviation but less common on hang gliders because, I think, it takes more effort to accomplish. But it's just another thing you learn about in both peer and formal training.