Well, actually IK is simple now looking at it. Just make sure you do your bones in a logical way. If you are planning on IK on the Arm, then remember that you need two small bones, one at the base (collar) and one at the wrist. These are very small. And then you will need one null at the small wrist bone. Then open the motion options for the bones and set them to IK, then when you get to the wrist set IK goal to the null. The base of the arm, you need to set the unaffected by descendents.
Good Luck.
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