Black Wulf is right on target. Most all preps should be done further in advance. Purchases of supplies can take up an amazing amount of time that can be put to better use in an approaching storm...believe me, after living in the Keys for 30 years I've been through more than my share of hurricanes. Murphy tends to rear his ugly head. A strained back or twisted ankle can put a big crimp in your alloted time frame for shutter installation.
The other thing that is missing is any consideration of bugging out. I don't know your situation, it may be that is not a nessesary option due to your geographical location but for anyone who needs that option it should be considered early and taken advantage of early. 48 hours out is about perfect in my situation, much later an I run into the traffic and fuel shortage problems.
I commend you Wildman for taking the time to think things out and plan for your family. Remember when dealing with hurricane planning earlier is ALWAYS better.