This is a soft, sticky dough so it is easiest made in a stand mixer. You absolutely can knead it by hand if you don't have one, just be prepared to get a bit messy. When kneading, you shouldn't flour the surface as you will end up incorporating too much flour and making the dough too dry. Instead, if the dough is sticking too much, you can lightly oil the worksurface and your hands to help, or just be prepared to get a bit sticky! A bench scraper is incredibly handy when kneading dough by hand to unstick the dough from the surface.