Gotta Go to Tmj Specialist And I'm Not Sure What to Expect..

I have no idea what i'm getting myself into! I even asked for details when I made the consult visit appointment and didn't understand one word of the technical terms/testing that she said I would have. She made it seem like it wasn't a big deal though. When I told my family Dr. That I had an appt. With a specialist for tmj testing, he said "be prepared to have your wallet cleaned out!" he told me insurance doesn't usually cover tmj. I wouldn't go but I had to see an ent with my ear and he wants me to go to see if that's what's making my ears feel full/pressure. I had tubes put in my ears but that didn't seem to make a difference so maybe it is my tmj.
Thanks for any input/advise that you may have!!!!
Tammy