No, the Passat uses a completely different suspension configuration. The axle itself is similar but the removal is different. You will have to loosen the lower control arm at the ball joint to get some play.
1. you can do both but obviously removal is more comfortable since you have to mess around it.
2. not sure, depends if the driveshaft is hollow, you could also mess up the threads.
3. no but make sure to tighten the transmission side axle bolts in a star pattern, preferably with clean threads and blue threadlocker. these can loosen up.
There's no DIY for this, if you want to take pictures and notes it would help someone else.
1. you can do both but obviously removal is more comfortable since you have to mess around it.
2. not sure, depends if the driveshaft is hollow, you could also mess up the threads.
3. no but make sure to tighten the transmission side axle bolts in a star pattern, preferably with clean threads and blue threadlocker. these can loosen up.
There's no DIY for this, if you want to take pictures and notes it would help someone else.