3D AutoCAD is tricky. I created my own "graphic" to visualize what plane I'm working in. As for dimensioning, I haven't had much luck so I rely on conventional 2D. Edges are hard to find in 3D and the dimension only projects in the plane our in (I think) I notice that Jack Sobon's drawings are nicely dimensioned, so I've wondered if he's addiong dimensions by hand. AS for prining, why would you print with hidden lines off?