Hi Bazz - I have not tried to remove the upper cowl yet, but looking in the Honda Shop manual it seems simple enough:
1) Remove: middle cowls, upper inner covers, windscreen, rearview mirrors.
2) Disconnect connectors: 20p black, 8p black.
3) Disconnect vacuum hose from one-way valve.
4) Remove upper cowl from frame grommets.
5) Disconnect connectors: horn, 20p grey.
Installation is reverse order of removal.
:-) ... Fred