Need Help! Removing Header Bolts

I am having great difficulty removing the header bolts from my RZR 1000. I snapped the head off of my hex tool, because one bolt was so darn tight. I am afraid of cranking too hard on another one, and I have no idea how to get to the upper bolts, because there is less than an inch between the bolt and the header. For anyone that has successfully removed their header, can you please provide me with some advice for both issues? Any help is greatly appreciated.