Buddypress, Appointments+ Integration

I am currently trying to display a service provider's buddypress profile avatar and an buddypress xfield (in this case an "about yourself") when the worker is selected in the drop down for "select a service provider" by hooking into app_excerpt. How is this done? The more detail the better since I am a pretty green developer. Specifically I'm having trouble understanding the relationship between the worker ID and their buddypress profile data.