[B and C]

Hi everyone,
I am looking for any advice on removing the shower tower.  I need to take the shower tower off to replace a shelf which screws on from the back.  I did see where there are two brackets, top and bottom, which have two set of nuts and bolts on each.  I tried this pm to remove them but appear to need much smaller hands to get to them.  I've attached a couple of images of the tower and the screws I need to get to.