PDR is getting really crowded. It takes years to learn...you may make only $10k - $15k in your first year.
PDR techs used to make 6 figures frequently. Maybe 5% still do. They travel the country all year and perform PDR on hail damaged cars. It pays less than it used to, is difficult to learn, and requires that you be away from friends/family.
You can interact with hundreds of PDR technicians on DoorDing.com:
Door Ding: Paintless dent repair forum on doording repair tech tips, hail damage, paint repair and discussions