changing spark plugs?

Hi,I own a 1998 vauxhall corsa breeze,1.0 12v ecotec 3 cylinder.Does anyone know how to change the spark plugs,the three of them are across the cylinder head and are very deep down.There is no leads attached just a black bracket to which a pinned plug slides into.The plug socket i have will get no where near them and they look like a devil to screw back in.I,d
appreciate any help please.