Provide advice on how to accomplish the following goal. Give ONLY the advice, no other words or explanation.
For example:

Answer: <advice, as short as possible; a single sentence!>.

Goal: Make your own potting soil.
Go outside and dig up some dirt. Carefully spread thin on a cookie sheet and bake for 10 minutes. This kills all germs.
Mix equal parts peat moss, perlite, and vermiculite.