Ben, maybe you could say why you are thinking of taking up Wing Chun in particular.
I've trained in a few different arts including Wing Chun and the training for each differs considerably - both mentally and physically.
Apart from the 3 forms and the dummy, Wing Chun is mostly trained with a partner at close quarters with no gloves or protection. It trains you to react fast and counter while maintaining focus. You should expect to get a variety of bruises and the occassional split lip or black eye.
Having said that, it will help you to learn about yourself, what you're capable of and what fears you can overcome, but only if you are fully dedicated to learning the art.
A very simple art that is extremely difficult to master.