So after finding the short cuts to delete selections and delete inverted selection I did isolate my horns in ReMake and I did then manage to get them into Sculptris and have been smoothing and pinching and generally finding it really pleasant. Intuitive I think.
Just have to remember that there is a limited number of times you can undo!
The brush is also cool, I need to see if I can change the shape not just size but the pinching, crease, and smoothing tool have done so much already!
And yes, I am building this as a symmetric piece so it may need care when I print- but I am inflating the base so that should give enough room to put in a foam layer for comfort.