As janicholson pointed out, you need to adjust the valves when they're on the "flat" section of the cam. In other words, when the cam isn't pushing on the push rod at all - the push rod should be loose, and the valve spring should have the valve tightly closed.
All you need to do is loosen the locking nut and then turn the adjusting screw in or out till the feeler guage fits between the rocker arm and the valve stem.
If your valves need adjusting, don't be surprised if the guage doesn't fit in at first - just turn the screw until it does.
Then just tighten the screw until the guage pulls in and out with some resistance, and just "feels right". Not loose, but not pinched.
At that perfect spot, hold the screw in place with the screw driver while you tighten the locking nut back down.
Then move on to the next one. (you'll have to keep cranking the engine to get each cylinder's valves into position)
If you find you're turning a screw in or out more than a turn or two, you're probably doing something very wrong, and should stop and recheck that you're doing the right valve.
Since it's the first time you've done it - you'll want to go back and check your work - probably several times. Just crank the engine a few times and check them all again.
Also as janicholson mentioned - it's very important to have the feeler guage FLAT - it sounds obvious, but it's less obvious when you're actually doing it. It's surprising how easy it is to lift or twist it a bit, throwing off the measurement. So do pay attention to it. move the guage around, back and forth, get a feel for what's right.
Only other tip I can think of is to press down on the back of the rocker arm (against the push rod) when sliding the feeler guage in - somtimes there's some give there, and you want to make sure the rocker arm is fully in the "up" position before trying to loosen it to fit the guage.
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Today's Featured Article - The Day Tractor Lovers Dream About - by Angus Crawford. The day started at five o'clock on the morning of Friday, the January 29, 1999. My father, my sister, my uncle, my cousin and myself all climbed into my uncle's Toyota van. It was six thirty in the morning and we had a long day ahead. We traveled for six and a half hours to our destination - a little country town with a population of no more then one hundred and fifty people (57 of them being children under the age of thirteen). We arrived hoping to meet up with a man we knew had over one
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