I use a Kitchen Aid stand mixer to knead the dough but you can totally do it by hand. If kneading by hand you'll need to knead it for at least 10 minutes. Mix everything in a bowl using a wooden spoon then once it comes together tip it onto a clean work surface very lightly dusted with flour and start to knead it. It will start off sticky but don't be tempted to add more flour as the gluten develops in the dough it turns smooth and elastic.