I presume you have Carrara5(or Pro).

Did you need to do a UV really?  If you have a good sized texture  image,(Jpeg?) ,you should be able to place it with cylindrical or spherical mapping in the shader room OK.

You could use that very same image (or another of your choice) in the Displacement tag to get excellent "bump" effects.

I really don't ever worry about  doing UVs mapping.

bwtr