I can't address all of your questions, but I can tackle a few.

There are several different ways to move an object in Bryce.  One way is to click on it to select it, and then just drag it to the position you want it to be in.

Then, you can also go to the Edit menu (the one next to create .. not the one next to File) and use the move and rotate controls  (the rotate control is a cube with three circles around it -- each represents one axis of rotation), the move control is a cube with three double pointed arrows coming out of it - again, each one represents one axis of movement.

Then, as you noted, you can fine tune in attributes.

I am not certain how the DAZ installer works with Bryce content, so I can't give you any help in that direction.  I tend to just import DAZ models as I would any other type of model, and texture them parametrically using the textures provided for each model.

That's probably of no help to you whatsoever.

Could be worse, could be raining.