To be honest, it is a pigging nightmare.
Personally if I had to do one, I would take the engine out as the access is ridiculous, especially to the top bolt.
That's exactly what I did for the alternator, which in my opinion has better access - although you'd still have to drop the subframe to get the alternator out in with the engine in situ.
Saying that, I've done it so many times, I can get the V6 out and back in within 3 hours so it makes sense for me to do it that way.