How the hell do you (get too, to) remove the top 2 torx bolt on the gearbox ????

i've removed part of the exhaust, and cracked the bottom 2 bolts but there is f##k all space to get at the top 2. Is there any way or easing the whole lot down or to the side to gain more access.
At present i can barely get the torx bit onto the bolt square so i don't bugger it up.

Any tips welcome.
cheers
Dave