First of all....straps = bad news! Like ski boots...clipless will allow your feet to release if NEED be! Straps won't.
I was able to get used to clipless on a mountian bike...but before I hit the trail my fiancee made me ride around, and around, and around, stopping, clipping out, clipping in, clipping out, over & over & over & over...
...am I getting my point across? Anyway, I think it was here on this forum I read that someone went to a park (lots of grassy areas) and practiced until she was comfy in her clipless. Once you "get" them you will love them!
Oh yeah...you can adjust (at least mine do) the tightness of the clip. You can tighten them as you get more comfortable.
GoodLuck!!!!
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