The moment you have, as opposed to the moment(s) you don't have (yet)--that's the trick, isn't it? that's the lifelong work of remaining where you are, rather than madly catapulting yourself into created moments, anticipated moments, moments most likely fraught with some dire prediction or other. All we have is the moment we're in.
For all the good it does, it bears repeating: all we have is the moment we're in.
Which begs the question, who am I trying to convince here? I'm certainly not teaching anyone anything they don't know--myself included. It's the putting it into practice where we need the reminding--daily, heck, hourly reminding. Minute-by-minute reminding, most days.
So we crack on and haul ourselves, kicking and screaming, back from the edge of anticipation and dread and back into the moment where we can, perhaps, catch a breath or two before chasing ourselves down again.