How can I avoid my MacBook Pro giving me minor shocks?
The solution for me was to use the adapter with a three pin extension cord.
Then your notebook is grounded, and no more charges stay on the cover that shock you. :-).
About steps 1-3
In steps 1 and 2, you reset the System Management Controller (SMC Reset) on a Mac that has a battery, which you should not remove on your own. The SMC manages hardware conditions related to temperatures and power consumption. You may also be interested in the question: When should I reset the SMC on a Mac?.
I'm not aware of the shortcut you performed in step 3.