hi ash, yes your head gasket has gone working from your details you will need to drain the coolant off,then remove the four nut's that are securing the cylinder head,once removed gently raise the head off the barrel you should be able to see what is left of your old head gasket at this point,remove gasket making sure that the head & barrel are spotless & clean before instaling the new gasket best of luck
steray
February 2009