Do everything you can to prevent razor burn before shaving down there, trust me you don't want that stuff. And before you take a razor to it, take a comb and a pair of scissors, just comb some back and trim it down before doing so. I recommend you do it in the shower also, to make it easier to clean up. Bring the shaving cream with you for sure, and apply post-shave balm.
don't look at me like that