Hey John, I don't know anything about the Porter Cable saw, but there are saws with easier blade clamps. The saws I know about are the DeWALT 788, The Excalibur saws, The Delta 40-690 and 40-695. All these saws pretty much have the same type of blade clamps and are easy to change blades. I don't have any personal experience with any of the other saws.
Before I load a new blade, I take a piece of folded 220 grit sand paper and gingerly sand the ends of the blade. There is a coating of oil left over from the manufacturing process. This helps with the blades slipping in the clamps.