Nasotracheal Endoscopy

I have been referred for this test.
Has anyone had one done? Would like to know what it involves. Will know more once I see speciaist too, which Im told should be soon, was only referred yesterday tho, so the specialist wont get it til Mon.
Have tried to google for info but can only find research papers on how the test has been used to diagnosed problems in particular case studies. Im after a basic patient information sheet!
TIA

Thanks for that! I didnt know it was the same thing as a broncoscopy! That info was just what I was looking for. Doesnt sound as scary now. Bring it on!! Will be great to find out whats going on