Old thread I know, but I can probably help clear up a lot of misinformation
Firstly, on a UK car, it's on the drivers side of the gearbox. Just above where the driveshaft sits.
Secondly, IT'S A REALLY EASY JOB
It took me literally five minutes, including jacking the car up. Go from underneath! It's really accessible, you've got all the room you could possibly want. It's a 22m spanner, plus a little pick to undo the electrical connector. Simple.
I hope this helps / reassures some random person in the future!