If your plugs are original then they will be difficult to get out. The plugs are good for 4 years or 100,000 miles (which ever comes first).

Like Carson356 suggested, use a short extension and turn them slowly (ease them out). Take your time doing this or you may end up with broken plugs - also make sure the engine is at room temperature (not warm or hot).

I prefer to use dielectric grease inside the boots and high temp anti-seize compound on the threads - it makes removing the plugs easier the next time they need to be changed.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles