When i've done percs before i've usually done rails. Both ways work great for me personally (dropping pill orally and doing rails), but i'd give the advantage to railing it. That's my preferred way of taking any pharmie, really. Of course mix this with a few beers, usually about 4 or 5 for me, and i'm straight for the evening. As far as how many percs to take, usually one does the trick for me.
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"There is a fifth dimension beyond that which is known to man. It is a dimension as vast as space and as timeless as infinity. It is the middle ground between light and shadow, between science and superstition, and it lies between the pit of man's fears, and the summit of his knowledge. This is the dimension of imagination. It is an area which we call... the twilight zone."