One size doesn't fit all, your body type, mental disposition, technical capability, knowledge and the tactical situation on the ground will dictate how you employ what you have learned.The tactical situation on the ground has the capicity to change at an alarming rate and your ability to respond and if need be improvise, has to be equal to these changes if not faster. Being able to read the on-going situation in combat is a skill that needs to be learned.
We cannot train for every eventuality as there are just so many variables that we may need to deal with, there are though some areas that we can cover that will help us sharpen our responses allowing us time to improvise. One way is to bastardize what we know, once we have perfected our techniques we need to bastardize them, this in reality is un-perfecting them. When we improvise we are not talking about using an incorrect technique, rather we are using the correct technique in a totally different way it was meant to be used.
Lets take drawing a pistol from a holster as an example:
The body mechanics for drawing the pistol from a hip holster begins the same but from the weapon clearing the holster the body mechanics change totally for both firing positions.