1994 Buick Century Instrument cluster removal

Looking at buying a 1994 Buick Century. The gas gauge, shift indicator and volt meter don't work. I can get a replacement cluster but need an idea of how difficult it is to replace. I've already seen that these have a cable problem for the shift indicator.
I was a mechanic in the 80's and still do as much work as possible on our newer vehicles, snowmobiles, etc.
Jim