Its very easy, and cheap as well, I did the same,

Go to Qatar air Gargo Section, (opp Fmly food centr, airport road) you will find lot of agent from all nationality, they are all licenced agent, you will find them in uniform, give your air way bill and your passport, wait for an hour, pay 110 QR( 80 fee+ 30agent handling fee ),you will get your goods on your hand.