This is more metaphysical than the basic technique. If I was going to exchange the hard drive in my laptop. I would visualize the entire process, noting the questions and problems as I completed each step.

  * do I have the proper tools? Lookup special fasteners
  * I will misplace the screws, a magnet or plastic cups would help
  * It might be dirty inside, I need something to clean 
  * I might drop a screw inside, tweezers
  * Could be dark, headlamp
  * cable might not stay in place, tape

It might take 20-30 seconds to run through all the steps in ones mind, anticipating problems before they arise.