Changing plugs Cerbie 4.5- Help

[dellard]

spoke to Peninsula Motors who say my miss fire is probably a duff plug. Ordered the plugs here today. Looked under the bonnet air boxes removed can hardly see the plug ends. Does this need a special tool? Peninsula cant take the car till late April and I want to drive it this weekend. Has any one done this op at home? Does anyone know of a local (Bristol) garage that would be game at short notice and not cock it up! Please help I really want to go to Castle Coomb. Cheers