On the A2, replacing a headlight bulb, although not without its difficulties, is still easier than doing the same job on any other car I've had.
Having said that, it really depends on with headlight blows. The British nearside headlight has a large space behind it on the diesel model. On the same car, the offside has less space, much less space. Still, even then, it's far more room to get your hand in compared to say, SouferKa, the 1.6 SportKa we also have.
Anyway, here's some tips to do the job yourself, otherwise a mechanic will charge an hours labour unless you're friends.
Right, get the H7 headlight bulb, make sure you don't touch the glass, as oil from your skin will get hot when the bulb is used and apparently can cause the glass to blow up. Hmm, really, really?
Also bring a shaving mirror, the one with a small frame, not the one screwed to the wall.
I thought that silica gel packs cellotaped to the headlight unit cover would help the VW/Audi lightcluster fogging. So far, it's only helped a bit, not by much.
I took photos to help...