The Gran Telescopio Canarias (GTC) is a 10m segmented mirror telescope that is under construction at the Observatorio del Roque de los Muchachos (Spain) and that is expected to have first light during 2006. The telescope mechanics is comprised of the telescope structure, bearings, motors, encoders, brakes, cable wraps and counterweights and also the Nasmyth instrument rotators and the tertiary mirror drives. The structure of the telescope was assembled at site between 2003 and 2005 and the rest of the systems are being assembled and tested during 2005 and 2006. This paper presents the process of the assembly of the telescope mechanics, the problems presented and the lessons learned during it, and the results of the tests performed.