Motomom wrote: ↑
Mon Dec 18, 2017 8:36 am
... I’m not sure if registration for the courses is still necessary ...
The material is freely available as a resource and if you look on Prof Delcamp's you tube page you can find lots of examples of how to play even the basic stuff. Registering for the courses is for getting regular feedback and following a formal curriculum.
As for back and neck pains the usual advice is centered on three items:
1) Get a doc to check it out.
2) Get a good teacher to comment on your posture.
3) Use guitar supports or a strap rather than a foot stool.
There are dozens, if not hundreds, of posts about posture/pain/supports here. A search will give a days worth reading material.