Don't have any advice for changing the actual switch. It's a bit of a pain from what I remember.
But you should be able to test if the problem is with the switch fairly easily. If the Fox is anything like the A2's, you should be able to remove the trim for the steering column to gain access to the ignition switch plug. Plug it into your new switch and carefully try it out (the switch is plastic as you know). If it cranks, you know your problem is with the old switch and the fun part begins.