Here are a couple videos that will help.The only thing I will add to the first video is that you need to bring the elbow up after have you done what he shows untill it makes solid contact on the face for your primary anchor.
http://www.bowtube.com/media/32/The_...th_Larry_Wise/
Another good video.
http://www.bowtube.com/media/6/Get_A_Grip/
You will want to be something like this when finished.Of course,you may not do things exactly like I do but this is a good base to start from.