Here is a quick exercise routine you can perform to help with shoulder pain.
You can build up to doing 2-3 sets of 30-60 seconds on each exercise. You can perform these exercises from home.
It is really important that you pay attention to the small details of getting not only the movement right, but also feeling the exercise in the right muscle(s).
Make sure that none of the exercises are causing any pain in your joints.
This is key to helping to strengthen the area and reduce pain.