In reply to dj rivum:
In the North Island Taranaki has some guides
To do a course unless there is one on through a club You may need to head south to Aoraki/Mt Cook., Or Queenstown, Wanaka. There are many good guiding companies. Alpine guides, adventure consultants, Aspiring guides( jagged globe partner) etc
I have used both aspiring and adventure consultants and both were good.