Irock,
No offense to any IT guys, but from my experience you do not make good phone guys. The ones that do start by learning the vocabulary, not how to program a phone system. It has a distinct langauge, and that varies from manufacturer to manuf.
The reason that the two fields are not that compatible between skill sets is that with phone systems, they often do not have "Restore", and some changes in one prgramming area with two keystrokes to change, may take 200 to put back, and require programming those strokes in multiple different areas in programming.
If you would not turn your basic phone guy loose on your network, then the same would go for an IT guy on the phone system.
Now if I was your tech coming in for $85/hr I would encourage you to go for it yourself. I would also not teach you how to do it for free, and then would sit back and make some more $85/hr if I did not change my rates to come clean up the mess. If you needed me to clean it up, and could not wait for the standard 2-3 days to be scheduled that would be emergency rate of 1 1/2 times my normal rate including transit time. This would also negate any warranty, or service contract as you had a unauthorized tech work on the system. By the way, unauthorized means anyone working on it besides my staff as certified does not equal authorized in my warranty documents, or maint contracts. You start servicing it, and you void your warrany with myself, except for items I authorize you to do within my warranty docs.
If you wipe the core firmware, or software from one of the modules, or processors, that is not covered by warranty, or maint contract my friend.