I've been struggling with animation (in general, not just Poser animation) for years now, with varying results. As Phil said, after a certain point, it's not science, it's art. The basics are pretty simple and straightforward -- once you know the essentials of the various types of spline, from there it's sometimes best to just dive in on your own and find your own way of doing things.

Best way to handle the scene you describe? Look at real life. Shoot a quick video using a couple of friends, then rotoscope it -- and in the process, look at it with an analytical eye. Honestly, tutorials cant teach you much beyond basic mechanics. To go beyond that, try virtually any animation book, because the techniques are all pretty much the same, whether it's Poser or Maya.

docandraider.com -- the collected cartoons of Doc and Raider