But don't panic. At Universal, there really is no need to make dining reservations far in advance, or even a few days in advance.
If you are going to eat at the parks or City Walk, when you get to the parks in the morning, just go to the dining reservation cart and make your reservations for later that afternoon/evening.
Also remember, if you forget to make reservations, your hotel key also gives you Express Access to tables at the restaurants. So don't forget to show your hotel key for FOTL at the restaurants.
We have been going for years and we have yet to ever make reservations. The longest we have ever waited for a table was 15 minutes when it was just our family of 5. (We waited longer once at Margaritaville with a party of 8, as they don't honor FOTL for parties over 7)