I did it, I didn't even chicken out.
I asked the hairdresser to take a before and after picture and she happily humoured me.
I think the funniest thing is how an optical illusion formed where the shape of my head and the size of my glasses changed drastically with bangs.
Thankfully that's more to do with the light and camera angle and less to do with head deformation (here's hoping anyway). See the picture below for a more reasonable after look: