I and everyone I have worked with has had nothing but good things to say about the Phillips body groom.
http://www.shaveeverywhere.com/
http://www.shavers.co.uk/shopping.php?product_id=637&utm_source=base&utm_medium=directory
This is what I use. It's brilliant. Generally I use it to trim round about and then shave the scrotum right down but I do finish it off with a razor so its nice and smooth.
It's great for trimming and tidying all body hair.
Other than that trimming with scissors is fine but not if you want to go close.