I think it's fairly straight forward. You might want to loosen the upper triple clamp pinch bolts to make it easier to remove the fork cap/plug.
I used to run 10psi in my VT Ascot forks, back when I had a low pressure fork pump. I either misplaced the pump, or gave it away because I can no longer find it. You don't want to use an air compressor to fill your forks or you may blow the fork seals. I would use a bicycle hand pump, or at least crank down the pressure on your compressor to no more than 10psi. There is not much air volume inside the fork, so it doesn't take long to over shoot your goal.
J.
PS. I tried to warn a friend of mine not to fill his forks at a gas station once. He didn't believe me & topped off his forks to whatever pressure he was looking for. Not long afterwards both his fork seals were blown.