I worked out was that there was a better way of working than my original conception of a patterned hexagon 'flower' surrounded by black, which I then joined using either a red or a purple hexagon, into a block. Conceiving it this way makes joining them more complicated than it need be.
I dare say any piecer could have told me this had I discussed it with anyone!
I have left the tacking on the back - can't see any reason to remove it at this stage. I have removed the papers as I go - leaving papers in hexagons that will be joined to another but removing any fully surrounded.
I'm feeling organised and enthusiastic about this project.