Never used BluTac as normally just put a bit of electrical tape over the socket.Hi
I've never attempted this without taking the upper manifold off, but I use a bit of blu tac in the socket when removing and replacing the bolts will hopefully stop you from dropping them down the back of the engine. Enjoy.
It takes 5 mins to get the manifold of, I guantee it will take much longer than that fiddling around trying to do it with it I place.