My personal pedagogy is two break down the steps to a project so students understand what they need to do for the certain step. I will have a demonstration at the beginning of each class then have a second one in the middle if most the students have finished the step. Below are example work of my unit plans and also lesson plans that i have given in the past the break down each step.
Example Unit plan: unitplanmetalgrade8s
Example lesson plan: Bandsaw safety lesson plan
Example lesson plan:Metal Work Day Two