I couldn't get mine out without removing the other ancillaries and pulling the AC pipes, I found it a bit of a nightmare to get off to be honest. However - I was stripping the engine anyway so didn't spend much time trying to figure out a way of doing it without removing everything else. Maybe one of those ratchet spanners with a flexible end, or a wobble end socket might do the trick? Have you got any of the bolts out the alternator yet?