You can always trace the shape vertex by vertex. It’s common when you’re starting to treat it almost like a vector software when you place one vertex at a time until you have the shape cut out and then you start to fill in with faces. That’s a simplistic approach, the one Martin gave you is the Modeling Neo sight when you start to see the wireframes in all the objects around you in real life and you start wondering an approach on how it would be the most efficient way to model this or that. That comes with experience and when you’re hooked on modeling.
