I have replace a bunch of meters over time. But all you have to do is just be careful about it. Mechanically, they aren't all that hard to replace. With patience and the right tools, it can happen with little difficulty.
Did you test the original meters and sure they are bad? Do you have replacement meters already? Know how to unsolder/solder? This isn't brain surgery or rocket science.
But if you are asking for a blow-by-blow description; then that may a bit difficult to recall and even harder to write up. If you ever had to replace a water pump, thermostat and radiator hoses, it is a lot of busy work, care, and patience that got it done right. Ask me how to do it? Well - that might take some time . . .