If i make minor changes to my address, in adsense account, will i have to go through the "pin" process again?
I don't think you have to get a new PIN. Your old PIN is sufficient (provided the change of address is within the country). Your next check will automatically be sent to the new address.
no if you have already received your pin you dont need to re enter your pin even if you changed your address
Nope you don't have to request a new PIN. I have changed my address before and I have experienced no problems.
but for security purposes you can email the adsense support and for sure they can assist you with this mate