Teaching Zachary to Weave through my legs

I have always looked in awe at dogs that would walk through their trainers legs as they walked. I am not sure what made me want to attempt this complicated trick. Teaching our Westie Zachary to weave will be a challenge. I have just started this process and I myself am wondering what I must have been thinking. Zach is willing to go thru my legs, but not sure how to set him up for the second leg. If anyone who has taught this trick, feel free to give me suggestions via the comment section.