Polar Shift - End of the World or No Big Deal?

The question about Polar shifts is not if they happen but when and what kind of effect do they have on the Earth and it's surface.  Scientist can prove that the Earth's poles have shifted before which means it will probably happen again.  They say this happens every couple of millions years.  Does it happen rapidly in a year or two?  Does it happen gradually over decades?  What will the effects be?  There are so many different theories about when the poles will shift and what will happen if they do.  There are also several theories about when this will happen.  Below is the evidence which I will allow you to be judge and jury of but we will discuss how to survive in case it does have drastic effects on the Earth and therefore our very survival. 

It's hard to plan how to survive something if you don't really know what the effects are going to be.  Make sure you always stock pile the stuff that is hard to get or purchase or would be in high demand if serious issues arose and then create a secondary list that you go get while everyone else is trying to get food water, water purifiers etc.  Plan out what you would do and if evidence presents itself that a threat is imminant then while everyone is coming up with a plan you can execute yours.  Planning ahead will give you an advantage over most people.  If there is a threat and people all find out at the same time, if basic services are even still operational, there will be a run on basic supplies.  (Are you going to work if you know the stuff is about to hit the fan?  We'll be lucky if most stores are open.)