Its pretty easy man. Theres two cables coming out of your throttle. You want the one that has an 1.5 inch piece of rubber. Fold that back and you'll see two bolts. Then just loosen the smaller one, now you can play with the bigger one to adjust the freeplay. When your happy with the free play snug the smaller nut to the bigger one and thats it.
When I did mine, my throttle was getting stuck on the bar end. If this happens just give the bar end a bit of a turn so your throttle springs back. Also once your done, with the motor running turn your bars from left lock to right. Make sure your rpm stays the same. Last thing you want is to accelerate when making a slow left turn.