I have had two MRI test before and the first time I was so nervous when the Dr. told me I had to get one done. For me, it help that I googled videos on how a MRI was done, you can find them in youtube as well. Make sure they have videos for MRI of the brain. I think it helped me because when I went to the appointment I already knew what to expect and so it was not so mysterious of what they would do. The first time I went in, one of the technician gave me a thing to hold, sort of a pump, and if anything was wrong then I could press it. There is also communication in there, the technician will talk to you and tell you when the next set of pictures will be taken and to not move, etc. and they constantly ask you if you are doing ok, well at least the technicians I got did constantly, even to the point that it was getting annoying. I found that trying to put a pattern to the noises helped the time go faster. Remember the less you move the faster they can finish. My procedure only took 25 min. and I had with and without contrast.
Wish you the best!