Just pull the carb off. Take off the throttle link by holding it WOT and it will just pop out of the trigger without having to take the handle apart. Remove the fuel filter, then pull the line out from the top. Install is the reverse, put some soapy water on the new line, and carefully pull it through into the tank with some long reach needlenose pliers. I think there is a flat spot on the hose that has to line up with the tank seam.
HTH