If you only use your hands, you risk having to dispense the longest hand job in the entire world due to overstimulation. No matter how deft and clever your handiwork, most men enjoy (often need) extra stimulation to intensify and speed up the process of orgasm. So while one hand is working on his penis, use the other to cradle his testicles or stroke a nipple. Use your tongue on his testicles or nibble his neck, the inside of his thighs and his nipples. Try holding one hand in an L position firmly at the base of his penis, pulling the skin back from the base (in the direction of his pelvis). Not only does it make him look bigger, but it also heightens sensitivity.
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If you and your guy are adventurous types (and even if you're not!), try using a small, cylindrical vibrator called a wand vibrator in addition to your hands. Hold it on his testicles or perineum (the smooth, hairless bit between his anus and testicles), or use it to play around the opening of his anus. Alternatively, grab a silk scarf or a strand of beads (make sure there aren't any rough edges first), wrap it around your hand or the shaft of his penis and slide it up and down the shaft and over the head.