I do not know if you guys have any previous experience. However I passed Phase 4 yesterday first time, and I found it all relatively easy (I have only 1 hour flying experience and 0 in a 737). Best advice is just enjoy it, and listen carefully to what he is saying. Nothing they ask you to do is particularly tricky, just a few bank turns and climbing/descending. I was then asked to land the plane, but he guides you through it. Like I say just enjoy it and you will be far more relaxed!