What is the best way for me to shave the hair in my bum hole?

I'm a 15 year old guy and i want to shave the hair in my butt because most of the time I wear White briefs and you can see the hair clearly though the briefs. I'm conscience about shaving it because I think that it is a sensitive area and I wouldn't want to cut it, but if it was the best way I would. If tou suggest something that I would need to purchase could you give me some examples of shops (UK)