Living the now is very important. You're still alive, your body still obeys you, so what is to fear? Use it! There's no better time to put your plan into motion than right now! (or, at least, as soon as possible)
"The yesterday is history. The tomorrow is a mystery. But the today is a gift. This is why it's called 'present'." ~Master Oogway, Kung Fu Panda.