I accept no responsibility for any cock ups made as a result of this guide

Tools needed (all done from memory so there might be small errors)
17mm socket + breaker bar (for wheels)
15mm socket (can be deep if you like) 1/2" drive
15mm 6 sided Deep Socket (known fits are Halfords Pro and Snapon) AND 15mm normal depth 6 sided both 1/2" drive
A minimum of 24" of 1/2" extension bars, ideally with locks, but tape will do to hold them ad the 15mm socket together.
screwdrivers/small sockets for the arch liner
For N/A
15mm ring spanner
15mm 3/8" drive socket + ratchet (and some sort of extension for the ratchet, or a breakerbar)
For Turbo
13mm 6 sided socket (1/2" or 3/8")
Accompanying ratchet for said 13mm socket.
Easy first bits.
Car off the floor, add axel stands if you are a whuss

Wheel off
Arch liner out
Long ass extension with 15mm socket up the chassis rail directly under the engine mount, you will find a nut up there... locate on the must and undo the swine.
Then undo the 15mm nut ontop of the engine mount.
Its your call now as to wether you support the engine or not..... I dont now as I've found you can use a breaker bar to lift the engine back up a few mm to realign the bolts, if you arent happy with that, support the engine with something like a bottle jack etc, that may mean the under tray has to come off (you can simply place some wood between the tray and the sump, and then jack on the tray.
N/A Specific
There are 3 15mm bolts in the engine mount bracket that are on the vertical plane of the engine (ie the bolts are horizontal) and well hidden by the subframe, so you have to undo them by feel.
One (or two) are longer undone with a ratchet on them than the space permits, so get the bolts slackened off using the ratchet and handle extension and then use the spanner for the rest of the job. Once the bolts are out, jiggle the mount bracket till you can lift it out of the car.
Take old shagged mount out, replace with new one.
Jiggle the bracket back into position, use a lever (breaker bar) to lift the engine back up and do the bolts up by hand at first and then nip up good and tight with the spanner/ratchet.
Turbo Specific
There are 3 13mm bolts in the horizontal plane of the engine (ie the bolts are vertical). They are easy to get to (if there isnt some stupid Charge cooler crap in the way

Take old shagged mount out, replace with new one.
Jiggle the bracket back into position, use a lever (breaker bar) to lift the engine back up and do the bolts up by hand at first and then nip up good and tight with the spanner/ratchet.
Finishing the job
Refit the 15mm nuts top and bottom of the mount
Refit liner
Refit wheel
drop to floor
DONE
WIN
goto maccy D's for a well earnt munch.