Luckily, the intake cam has a groove in the shaft in the middle of the cam and the exhaust cam doesn't so they are distinct!
Scott, I figure over time with heating up and cooling down, the cap bolts tighten. I've done my valves a number of times and am always careful about torque on them and every time I loosen them, they give a loud snap as they break loose. Steady, even pressure on them is my best advice. You will either break them loose, or break the torx bit!
btw, I would not attempt this job for the first time
without the shop or Haynes manual.
