Hi,
If you can see the 2nd hand one work before you take it, that's always a bonus.
You have to remove the wiper arms to allow the grill below to come off. This allows you to remove the rain guard above the wiper motor, this is the long plastic bit at the back of the engine bay. Once you have gained access to the motor it's a simple unbolt and replace job. Remember to fix in your mind the position of the wiper linkage (or photo with your phone), this will make it easier to get the same orientation when you replace the motor. If you haven't seen the motor run, it's a good idea to try it before bolting it in. Don't attach the wiper arms until you have run the motor and parked it, otherwise you may find the wipers are trying to wipe your bonnet.
Cheers now
Ken Chapman
May 2007