Yes, the mirror does make quite a distinctive sound, I found it quite loud myself the first time I tested the camera. I soon got used to it, and as bon-jip suggests you can use mirror-lock-up if you are worried about mirror vibration.

If you want to get used to the camera, run a roll through the camera and keep the spools and paper backing. You can then use this 'test' spool to become experienced with the operation of the camera without wasting any film.