quick tip if any one is doing their timing chain or belt. make sure you have a picture showing the tdc( top dead center), double check all the marks match exactly no error is tolerated here, the crank, exhaust cams, intake cams etc.
the tip is first throw the belt on the crank, then align the belt on the cam which ever is far away from the tensioner, then on the cam closer to the tensioner, mae sure you dont have any slack on the belt, have all the slack towards the tensioner this way you will reduce the chance of the belt jumping tooth.
after assembling the belt make sure there is no slack,rotate the crank it should rotate with out too much resitance and the belt should not be jumping.