Qria...you can use as reference this page here...
http://help.thrixxx.comThis will only give you the guidelines, you have to make experiments until it ends the way you like.
The editor might look limited at first (it kinda is in some points) but you have to keep in mind the posing itself is done with junction points, for example if you want to sit a model down you have to work the hip in translation mode, when you move the hip down the legs will flex give the base of a sitting position.
You just have to rotate the entire body (Shift+click on the hip in rotation mode), and work the other junctions (The Shift+click shortcut works ins translation mode too, but to move the body horizontally or vertically).
Some advices, make sure you have
[Automatic Keyring] and [Character Collision] enabled and
[Key Editing] disabled, that will save lots of headaches and lastly if you have difficulties in visualizing a certain position, it helps if you have a touchable reference like a doll, you can use a toy doll like an Action Man or Ken doll or something like that, but the ideal is a wooden manequim because you can see the working juctions and pose it the way you desire.
Have Fun!