Ive had the gearbox off of my 2.0 fiesta more times than i can remeber. Either beacuse of blowing the box to pieces or because it destroyed a clutch.

Its really simple to do and i can get a box out on my own in well under an hour if i have an impact gun. ITs a two person job getting it back on though as the boxes are quite heavy.

One tip i would give is to take the frame which holds the passengers side lower arm in place off. This will give you a lot more space to play with when refitting the box.