I've been using the clip less pedals for a week now, not long, but I must say it's been a lot easier than I expected. Clipping in has been fine, once or twice I struggled, but most of the time it goes in first time, I find the more I try, or worry about it, the more I struggle, whereas when I'm relaxed they it tends to go straight in.
As for unclipping, no problem whatsoever, and no moments. As commented above, I think if you expect a moment, then maybe you'll have one. It's really not that difficult (I know a week is not a long time to go clipless, but I'd assume that the moment becomes less likely over time).