Just install Tor with the default settings and then in bitcoin-qt go to settings, options, network and change the port to 9150. (make sure "Connect through SOCKS proxy" is selected and that the SOCKS version is 5)

P.S.  I not sure if Tor is set to configure controlport automatically by default or not, but if the above doesn't work you can try going to the advanced tab in Tor and deselecting it.