I have a 94 Accord EX with almost 225K miles on it. I forgot to change out my spark plugs at the 200K (they were changed at 100K), and now one of them appears to be stuck. I'm trying to figure out whether I should have a mechanic attempt to remove the stuck plug, or should I just replace the plugs that came out easily and worry about the last plug later. If I have a mechanic attempt to remove the plug, what are the risks if the plug breaks? Thanks in advance for any advice.