I have a great tri bike with Look pedals but I put a cage on them and ride with normal shoes. Bike shoes have always scared me (the idea of just keeling over at a stop sign)! I feel like now that I'm getting more serious about the whole sport and biking in particular I should get biking shoes (tri specific). Is there anything I should be looking for that may not be obvious. How should they fit?

I know the question is silly but I've just always been so intimidated by biking shoes.

Thanks