Research Vertigo Technique

Having watched Film 2011 a couple of weeks ago, they highlighted the technique Alfred Hitchcock used in Vertigo 1958 it was also used in Jaws 2 1978, where you start zoomed in on the subject, then track forwards whilst you zoom out with the lens. I then saw the same technique being used in other films including Godzilla 1998. I think its a great effect that shows the overwhelming sense of danger the character is experiencing. So I thought I would have a go at it, just handheld and very shaky as I don't have a track and it didn't really matter because I was just experimenting as to whether I could recreate this technique.