Chapter (4) : Personal effects and household items

Article (103)
The personal effects and used household items brought into the country by the nationals residing abroad or the foreigners coming for the first time for residence in the State shall be exempted from customs duties, subject to the conditions and restrictions...

http://www.customs.gov.qa/eng_cust/enactment/customs/lawforqatar/part8.jsp

DDU Shipment (Delivered Duty Unpaid)- where goods placed at the disposal of the consignee (you) at Doha port, therefore, upon cargo arrival, cost will be: docs fee, customs clearance (minus the import tax) and haulage service to delivery address.

suggestion, if you don't know of any good forwarder here in Qatar, send it DDP.