You need a set of ratcheting spanners, (open one end, ratcheting ring the other)you can get one down there and its simple. I pull a couple of Escorts apart every year and always pull the pedal box's and brakes boosters and brackets off.
These nuts are 12 or 13mm I cant recall? You could buy just the one spanner but you can buy cheapy sets from about $60 that will give you the common sizes (10,11,12,13,14 & 15). I think I paid about $90 for my Kinchrome ones
You will be surprised how often you use these. Of course if you have a mate with a set you can always borrow 'em.
Cheers
Shaun B