Tying a bow tie is no easy task. I often arrive on wedding day to take pictures of the groom getting ready. A common scene is to find the groom with phone in hand, watching a video on how to tie a bow tie.
I found this video a while back when I was learning how to tie one. I don't wear it often enough to remember how to tie it, so I favorited this video. It's the best one I have found so far.