I have tried different methods of getting to the adjuster on the alternator - as easy as poss. Ended up using the method of removing the air duct from the intercooler - faster, and convenient working position.
To lessen the strain on the alternator and battery, you can disconnect the intake heater. It's not required anyhow - just a environment issue in cold climates. Pull the little plug next to the heater relay. (it's been discussed here earlier)
Another thing is that the original belts are actually a bit narrow. There is a good quality replacement which is about a mm wider. I'll dig out the specs and post here. The length depends on whether you have the Power Heater or not.
Edit (belt specs):
I think the original is 9.5 mm wide, 1000 mm long.
Replacement:
Either ContiTech ZPX 1000, which is 10 mm wide
or another Conti (don't know the model) which is 11.9 mm wide, but then increase the lenght to 1013. Works like a charm.
For dual application, Conti sells belts in pairs, with exact same lenght, to prevent uneven/unbalanced load.