Will C,The sternum (breastbone) will be divided in half with a special operating instrument. The doctor will separate the two halves of the breastbone and spread them apart to expose the heart. This is one of the major issues why it will take longer to heal from open heart surgery as cutting into your breastbone is like breaking any bone in your body and it takes time to heal.
I agree with staying ahead of your pain as it is easier to prevent fires than to put one out that is already raging.
Take care,
Kitt