Oh don’t worry, you don’t have to memorize those steps. Modeling is very trial and error, even more the super advanced modelers. You begin shaping the mesh the best way you think to approach it and before you know it, it was not the most optimal way and you have to start over. It can happen a couple of times before you settle on a good mesh configuration. So no need to memorize steps, the more you practice, the more you’ll feel the best way to approach each situation you encounter.
