The Rosso twins are
Join Date: Oct 2011
Location: United Kingdom
County: Tyne and Wear
It is possible without dropping the subframe, but if your doing it on the driveway etc then it is a complete PITA, and personally I dont think removing the subframe is much of an issue, although some may disagree, but I would just take the opportunity to renew the ARB bushes etc while it is out.
If your decent with the spanners then the removal of the box is pretty straight forward, refitting can be a pain, plenty of threads about this, and make sure the release bearing is fitted correctly, and check it engages before you finish everything then find it wont work.
Sorry cannot help with the Elearn link, but the old 156 forum used to have a good write up on the removal and refitting of the box if you Google you should find it.