Projections now put Irma as travelling essentially straight through the center of Florida. If you are in that cone of possible paths, you have at least 4 days to prepare.
And, of course, leave the areas.
And if you have a decent hurricane shelter and haven’t prepared yet, well, I don’t feel too bad if you have to pay extra for water and other supplies if you are panic buying.
But I am a cruel, heartless, mean, prepping conservative, so take that into account.