How to grow a beard/moustache: When you are ready to grow a beard stop shaving completely. Do not shave at all for at least the first 3 days of growth. One of the most common errors is to attempt to start sculpting the beard too early in the process. Even if you are just planning to grow a goatee you should let everything grow for at least 3 days. WHY let your beard grow for 3 days before you start to shape it? If you don't wait, you might cut off more than you really wanted and you can always trim it down to a smaller size later.