There was no 2007 Honda Civic GL 1500 sold in the US, or any other 1500cc Honda sold here in 2007. Please advise us what country this car was sold in. You will probably have to consult a dealer in your country for more detailed information.
From what you described; it soulds like you are trying to loosen the mounting nuts for the ignition coils. Hondas all use metric fasteners. When the nuts are unusually tight; it sometimes is necessary to use a 6 point socket instead of a 12 point socket; as they grip a lot tighter without slipping. An impact driver plugged into the socket may also be necessary to put enough force on the nuts to loosen them. Impact drivers are commonly available at motorcycle shops and tool supply stores. They are an essential tool for working on Japanese engines. You just set them to loosen; and hit the end of the driver with a hammer. The force will break loose nuts which will not come off by any other means.