I've had both types of ultrasounds. I didn't like the ultrasound guy, but the woman that actually did the ultrasounds was very nice. They should have you empty your bladder before the internal ultrasound (I was so happy at that point I didn't care what they were going to do).

If you have more questions, let me know. I'd be happy to share whatever info I may have that would reassure you. It's very scary going in and not knowing what to expect.