How hard is it to replace the distributor shaft for my '93 Altima?

I have replace a distributor cap before but this is the shaft so unsure if it would be that hard to replace?How hard is it to replace the distributor shaft for my '93 Altima?its really easy, just pull the plug wires, remove the dis cap, mark the location of the rotor button to the distributor cause when you pull out the dis its gonna rotate some. then line up the new one in the same direction that you marked the old one and reinstall.