I forgot to add that they should hopefully do heat/ultrasound/E stim/massage/infrared light or low level laser to reduce pain FIRST!!!

These take time - maybe weeks or longer and you really need to be very careful while at home.

{This is only my opinion but it seems logical to me...
If you are working or still doing problem activities those treatments may only put you in a "holding " pattern. Because as you work you are undoing most of the good the PT might be doing. Been there done that. I had been to 7 PT places thru all my various RSI. shoulder strains and then TOS. }
Your useage "Bank account" as Butler calls it.

Then some gentle stretches

Then maybe add some isometrics {self muscle tightening and releasing}
and/or use a biofeedback machine to see how muscles are acting and reacting

and if things are going well and pain is reduced and no increase of any symptoms then add some posture exercises - nothing very aggressive.

For me I found after getting out from the worst of the pain/symptoms I was able to do most of the stuff at home on my own.
triggerpoint, stretches, relaxation, posture work and even weights.

I did have to have my top ribs dropped down {they were stuck and raised from spasms} and the only one that figured that out was a teacher of PT & my chiropractor has been a long term help for me too.

But these approaches don't work for everyone.