I had to do PT 2 times a week, for 3 months, for my shoulder. They assisted me non stop at first. Made sure my posture was correct while doing the exercises, etc... After I knew the routine they handed me stretch bands and let me get to it. At the end of every session I had a very relaxing 30 min session with ice packs and the tens unit. I enjoyed that so much, I bought one for myself.
The exercises did help with pain, for awhile. I've since discovered my neck is the source of my shoulder pain so I wasn't really getting what I needed. Not PT's fault though. They were very nice and helpful ladies, IME. I honestly can't remember the cost but it wasn't outlandish with my insurance.