I can tell you from personal experience that programming a Partner is not easy for someone not familiar with it. You need to make a proper valuation of your time.

I must warn you that I get calls every day from people who have bought some junky old phone system on the internet because they thought it was a bargain. Then they call me to program it. Well I am not in the business of working for free, and it is going to cost them more to get this thing properly cabled and programmed than it cost them, and it is still won't do what they want.

Look at it this way. Would you buy a ten or twenty year old proprietary computer for your business, thinking you could just install and program it yourself? Of course not. Well a phone system is just a computer.