15 years ago I used a paved cycle path to start/learn with my new SPD's. About a half-dozen falls, some scratches and bruises and I was good to go. They are now entirely instinctive, the old cellular memory at work!
I have come close to not being able to unclip a few times over the years, but that was due to worn out cleats. Make sure you replace as needed!
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"I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.