Ravenheat RSF 84ET Boiler - changing the hydraulic diverter valve?

i've looked at the valve in situ and cannot see any obvious difficulty in disconnecting / replacing the valve myself. Apart from the limited access , i can only see the 5 brass nuts that need to be undone to release the unit then reverse to connect the replacement. Am I missing anything ?. Would I be better advised to leave it to a trained plumber or is it simple enough to do it myself ?. Any advice / information would be greatly appreciated . thanks.