Okay - good information! If you are just checking the valves...all you need to do is get the pesky cover off, rotate the engine CCW, get the marks in place and the stick your feeler gauge in there, correct? the actual tough (and for me intimidating) part comes when you are swapping out the shims for correct size new ones...right? Reason why I am asking these stupid questions is I am meeting a friend from the US in Medellin in about 6 weeks and he could bring the new correct shims easy enough - shipping stuff to the Philippines is like going to the moon.
Yes to the first part. Make sure you are in the correct TDC with the T-mark on the crank. Meaning, when you get to the T mark, check the position of the camshafts. The "pointed" tips of the cams should be facing slightly up and outwards of the cylinder (not facing inwards). You'll understand what I mean when you see it. Another way of knowing is you will feel the crank want to spin and will spin slightly anti-clockwise on its own sort of, as you are turning it, right before you get to the correct TDC. I do believe the camshaft arrows will align on the cylinder head when you're in the correct position.
And as Reveille mentioned, you have to measure first, before knowing which shims you need to swap and what size. I recommend you get the smaller shims for your exhaust. I'm guessing around 2.45, 2.40, or even 2.35. The intakes might be ok at 2.55 or 2.50. One of my exhaust valves wanted 2.35!
You will need to pry the shims off the buckets. The buckets have these notches where a small screwdriver fits into for prying shims. You will also need a telescoping magnet to get the shims out from under the camshafts.