In order to work with templates you need to have a good understand of blueprints and orthographic drawings.
A craftsperson should be able to look at any drawing and determine what is to be built and or fabricated. This person should be able to look at a pictorial drawing and in-vision what the orthographic would look like and vice versa.
You must be able to identify line types and there uses and what features the lines are trying depict.
There will be times when you will have to in vision either the perspective view or the orthographic drawings to help you through the build process. It is sometimes helpful to make even a hand sketch of the missing drawing to help you see what is being built.