I'm glad to hear someone else say Norstars are not so easy program. I always thought it was a hassle. 3 digit codes to perform basic functions... really? But the telcos loved to put them in so there are a bunch of them out there and anyone servicing phone systems will run across one eventually.
Now, to topic. IF, you can find a manual and have a chance to take it home, then go for it. IF, you can figure it out tell your brother you'll install it. The wiring is easy as it gets. Chances are it will work as is, but you'll have probably have issue of lines ring/not ringing at every extension. IF, you any doubt, hire someone who can do the job with confidence.
