My advice would be exactly what bloodsong said. The only thing I'll add is that having done all of that you may still want to adjust the centre of rotation. It's easy to do but since I don't have Poser on this machine I can't remember the exact menu sequence. For props I think it's under object -> properties. There's a button to show the local axes (ie a set of axes at the rotation centre) and it makes three new dials show up on your prop, allowing you to adjust the centre point. For figures, you can use the joint editor to position not only the rotation centre of the whole figure but also the rotation centres of each individual joint.

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