I've never been a big fan of the phrase, "Live Every Day Like Your Last". If I was going to do that, I would book the most ridiculous multi-leg flight possible, and go try to see my loved ones one last time. On the plane I would work on my will and write people tons of letters.
That would make a fine last day, but doing that every day would leave me broke and leave my friends and family very confused. On the plus side, I bet my penmanship would improve considerably.
I get the sentiment, though: life is short, and if you put things off for too long, you may never get around to doing them. Maybe there's a better cliche to follow, though: "Live Every Day Like Your First".
Imagine that you just now gained consciousness of this person you call you. You get to keep all of this person's previous memories, knowledge, and experience. You poke around this person's head and quickly assimilate all of his or her desires, goals, fears, and ambitions. Because you're a smart and rational consciousness, you know that you've got some time to work towards those things. What do you do?