Hi Jerome,
I think if you have a well-recommended specialist, you can often be confident in his/her recommendation. If you have a not-well-recommended therapist, then you may want to look for a second opinion or options. It can be difficult to figure this out as a patient. So if you know other people who have been to this specialist, ask them how things went. Ask around. People really do like to share information if things went well or didn't.
Hope things go well with you!!! I completely understand the issue with injury and not being able to work. Especially when your job relies on your physical ability, so I hope you heal well and quickly.