Since it was raised and I mentioned it again on my 'fear' thread - based on seeing a rider fall into a car while we were riding once because she couldn't unclip going so slowly up hill --- what advice to the experts have?

How the heck do you unclip so you can stop, when you're going up a steep hill so slowly?

At this point if I came to a hill that I wasn't positive I could get up I would most likely stop and walk my bike up it. But what if I'm half way up before I realize it? What if there is alot of traffic? Oy vey - just made myself scared all over again.