Amy, I would think it would depend on two things...your total calories and the type of fat you eat. Healthy fats (nuts, avocados, olive oil, fish, etc.) are much better than the partially hydrogenated stuff that is in fatty foods. Maybe you can determine what percentage of your calories you want to come from fat and then figure out how many grams of fat from there. I've seen people shoot from anywhere from 15-35% of calories from fat, so do some research and some experimenting and get a sense of what's best for you.
And now that you don't have to be perfect, you can be good.