Okay good. VNAV is used rudimentary and then as you are flying into the terminal environment, it is necessary to use all 3 methods pertaining to the conditions that are presented. Makes sense! I never really knew what methods the professionals used on most accords. Thanks for clearing that up.
Now I only happen to be a student pilot in training, but currently use X Plane (laminar research) to exercise my instrument navigation and procedures. Having a flight simulator is quite useful when you're not in the airplane but have that urge to fly!