skills, insights, tactics are needed

Dear birders and hawk-watchers (and there is a big difference): I have been trained - in the field - (unofficially) by 5 professional hawk-watchers. All of these professional birders also have other professional disciplines. Yet, I have gained not one shred of my skills, insights, and tactics leading toward finding and observing Northern Goshawks from any individual or organization. If you have an intelligent question, I will try and give you an answer. Let me explain - I have never seen a Goshawk nest. I have never seen a Goshawk take prey. I have seen Goshawks carrying prey. In New Jersey, I saw a mature, female Goshawk at elevation of about 200 feet, flapping as she carried a large possum.