To do the job quickly and easily you need to jack the car, take both wheels off, both wheel arch liners, on the drivers side you need to undo the 15 i think or 17mm nut and split the track rod arm joint, and tie it out the way, use a 3/8 ratchet and put in the alty belt tensioner and release the belt, remember the way the belt is put on, draw it first if you need, then you should be able to get to the bottom bolt, it's very tight and you need small hands, it's a 13mm socket but i did mine with a ratchet spanner, then you need 2 people, go from the passenger side wheel arch, 48"'s of extension bars joined together, and universal joint and a deep 13mm socket on the end, pass it right through from the passenger side and the second person locate's it on the top bolt, you have to crack that from right through from the passenger arch...
Now on top of the alty is a L shaped bracket and 2 10mm bolts, this was a pig to get to, some people drop the Y pipe off to do this, but i could not undo the nuts on my Y pipe as limited access, so i went from where the flexi pipe on the exhaust is in the recess above it, , bend the heat shield out the way, over the top of the front subframe, using a 3/8 flexi ratchet and extension bar with a 3/8 uni joint and a deep 10mm socket, put the bar made up with the socket and joint on through first, then when in place attach the ratchet, I am warning you it's bloody tight, then crack the nut and take the ratchet off, then undo the bolt by hand if you can, if you don't take the ratchet off you will not get it off after you undo the bolt.. the alty then will need to be prised down and turned round, now from the drivers side arch undo the 3 wire connector and the main cable, 10mm nut again on the back of the alty, then feed it through the drivers side arch, allow yourself plenty of time, and pre spray everything first with plus gas, not WD40 it makes the nuts slippery... replacement is reverse, you don't need to put the 10mm bolts back for the L shaped bracket, as Ford changed this at a later date, it also makes it a lot easier if you need to take it off again.. good luck chap.