As I clip the coupons, I make piles based on my categories. My 1st set of piles is very general: non-cold foods, refrigerated foods, frozen foods, personal care, and cleaning.
Once I clip all of the coupons and put them in the general piles, I pull each set and divide them into more specific categories (AKA my binder categories). I only do one set at a time so the piles don't get too crazy at once.
Then I go through each spot in my binder and pull expired coupons and put in the new coupons.
If I have the same coupon but it has a later expiration date, I put it in the same slot but in the back. That way you don't use a coupon that expires two months from the day you are using it before one that expires two days from the day you are using it.