i was always told to replace sprockets and chain together, my buddy changed only the sprockets on his bike, and sure enough a few thousand miles later, his new sprockets were destroyed, missing teeth, and chewed all to hell. so i would say you would need a chain breaker tool, or a cutoff wheel on a die grinder as well. lol
I dont know if you have already attempted this job but you will need to have a chain tool to press the master links together. Most people just cut the old chain off with whatever thay have. I assume you have other proper tools like torque wrenches to remove and install the rear wheel. And a copy of the shop manual is always handy. Google search for a free PDF version.