There is no right amount of fat. Eat what it takes so you're full and not snacking. There's no requirement for Primal to be a high fat diet. The emphasis here is on eating real, whole foods and avoiding man-made frankenfoods like processed oils, isolated sugars, flours (be them grain flours, bean flours, nut flours, etc), legumes and the like. If you want chicken breast and sweet potatoes, that's just as good as steak and avocados if you find it keeps you full and energetic all day long. I use very little oils and fat sources and eat meats, fruits, starches and vegetables, so my fat intake is probably around 30% daily calories on average. That's probably half of what a lot of Primals eat, but I consider oils to be processed foods that are largely full of empty calories. My focus is on whole foods first - yogurt over butter, olives over olive oil, coconut over coconut oil, pork over lard, etc. Any fats I do use is typically grass fed butter and an 8oz block will last me a month. YMMV.
Don't put your trust in anyone on this forum, including me. You are the key to your own success.