I started trimming about a year age and I think it's great, way cooler and the whole area becomes more sesitive to the touch. I recommend you trim it down to about 3/8" everywhere you can reach. Including your scrotum and between your legs, you won't believe how clean and cool it feels with no itching or irritation. The easiest way to do it is to take a comb and a pair of clippers (the beard trimmer attachment on most electic razors will work fine too). Comb the hair throught the comb to the desired legnth and use the clippers to cut it off. You're basically clipping against the comb which guarantees you won't knick yourself or cut too much off. Between your legs is a little trickier, try blund ended scissors and go slowly.
I also recommend trimming your armpit hair to 1/2" to 3/4" length (any shorter will feel picky). Much cooler and more comfortable.
I tried shaving a "test" area one time, way too much irritation and too itchy and prickly as it grew back. So unless it's something you want to have to do every few days I wouldn't shave. A good trim feels good for several weeks before a touch up is needed.
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Trimming Pubic Hair... 
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