Help with braking

Hi guys just got a new xp4 1000 blue last week. Took it out for my first rides on the weekend. There are a lot of steep mountain trails here on vancouver island and was wondering if anyone knows the proper braking technique for coming down real steep trails. Going up is easy coming down is another thing. I put it in high and used the engine brakes but when it picked up to much speed I had to touch the brakes , then the free wheel kicks in and it sea like you have to stop it completely and the hit the gas to get the engine brakes back. Should I bee in low i tried it and it felt to jolting coming down and kind of skidded a little. Anyone have more experience I am a newbie at side by sides. My quad always had the engine brakes and no free wheel. Thanks