Trying to implement the offset pursuit steering behavior

I'm currently learning Unity, and I'm trying to implement the offset pursuit steering behavior. However, I'm not quite sure on where to start with coding this script. From what I understand, you have to get the target's movement vector, and then the prediction of where the target might be going, and then it's basically the sleek behavior. But like I said, I'm not quite sure how to code this. Any suggestions on how it might look?