It is, I tried it 2-3 times (at the same time when removing Nvidia's, in safe mode) and it worked well. Make sure to cut the web so Windows doesn't install drivers automatically. Either take the cables out or disable the network interfaces.
you can also use "stopupdates10" to block updates and install realtek audio driver. no need to pull off cables or stop network. m$ updates is a stupid process. it blindly overwrite newer driver with its old driver for realtek.