I think it's more like riding a bicycle you never really forget how to do it you remember the motions and everything. But like anything else you gotta do it, practice it and get back into the groove of it.
I don't think so. It's kind of like biking. Once you've learned how, you'll always have that 'muscle memory'. You might be a bit rusty at first, need some warming up, but you'll get the hang of it pretty fast.