Quick word of warning here, i dont know about anyone else, but the 190 series do NOT work for me on 9.10. I have tried the beta and the final release, and both just produce the a black screen on boot, with no access to ctrl+f1 or anything. total system crash. I have to go back to using the 185 series. I have the same gpu as youself, which is why it may be a problem, not sure tho, so have the 185 series downloaded aswel, incase there is a problem. Hoep there is not though.
To install them, download the drivers to a directory, i keep mine in ~/ for ease, then press ctrl+f1, and type
sudo service kdm stop
then enter your password, it will then take you to your users home directory, ~/, and you can type
sudo bash NVID(name of driver)
and then follow the instructions