Not so much with narcissism but taking photos of yourself can be fun! Well, you'd just be surprised that you look different or good at one particular shot at one particuylar angle and at one emotion. You look the way you never thought you'd look.
It's simple. I put my JVC camcorder on a tripod and turn it on. Then I walk in front of it and do what ever. After down loading the video. Stills can be made from portions of the video. My editor allows me to make still clips.
The best tip is don't use flash! Try to put the mirror where it picks up your image with natural light, bright but not too bright. That way you'll have plenty of chance to alter your image in your favourite photo program. Oh, and try to take just head and shoulders, rather than full or part body with one arm shooting off to one side, in which hand you have the camera! God luck!