Honestly, if you can keep checking throughout the day, more than likely you can get what you want.
I can say I have gotten almost everything I set my sights on by just checking throughout the day, for the past few years.
The best one that shocked me was a table for 9 at O'hana the day before.
Last month we decided to go 2 weeks before and I was able to get Le Cellier and California Grill.
We are going again in one week and my main goals were Hollywood Brown Derby and Topolino's for breakfast and we got both just in the last few days.