sounds like a simple job when ye say it quick, actually can end up quite expensive. say 2 lenghts worktop circa €300,disconnect hob, sink, remove worktop. if quite old chances are its 30mm, standard now is 40mm which means you're into a wall tile removal senario (30mm are still available in limited colors) fit new worktop,(new hob, sink, taps?)if gas hob you're lookin at €150 connection fee. you'd be lucky to have change of a grand