How do I remove the sparkplug for cyl #8 on my 4.6 l

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Cleaned any debris from around spark plug using carb cleaner and compressed air.Using 5/8" swivel sparkplug socket 3/8" drive.Lubricated rubber bushing in socket and it still won't push down onto spark regardless of angle .Fuel rail and injectors out of the way.All other plugs were fairly easy to remove and install new one.