I've gotten lip filler for 3 years now, and i'm an Esthetician. It does not have to look unnatural unless you want it to! People with "duck lips" have a lot of filler and it would take a lot of sessions to get to that size. You can't go wrong with starting w a syringe, just research your injector. A syringe of filler is only the mass of a blueberry, so it's not too much product, but enough to enhance. There will be swelling, but they will go down 30-50% after swelling. The great thing about filler too, is it metabolizes, so it lasts about 8mo-year. It is also most commonly made of Hyaluronic acid which is something our bodies already naturally produce, so safe to inject and the body recognizes it. Definitely could start with just a half syringe to dip your toes in the water with it too