^^Yea until you spill gear oil in your car somewhere and it wreaks for several weeks
From the engine bay is easy peasy- doesn't require the bezel, shifter & sound/dust boots to be removed (along with any grounds for stereo, gauges etc).
Pump/aspirator is perfect for the diff.
Either way, pretty much every method is now covered in this thread... Other than the 'take it to Jiffy Lube & have some minimum wage DB do it' method haha!