Thanks. Well, the engine was rather warm, but not "hot" when I tried to remove it. I did not even attempt the others after the first one failed to turn. I used a 1/4 inch ratchet, so perhaps I should use a larger 1/2 inch ratchet? Unfortunately, I do not have a "breaker bar" nor a torque wrench. I have changed plugs in a lot of cars and I have always just got the plugs finger tight, then used the socket/wrench to snug them in- never had any problems doing that.

Thanks for that tip. I am off again tomorrow, so I may give it a whirl again if the weather co-operates. It was 66* today, but 41* forecasted tomorrow, so it may have to wait. Back in the 50s and 60s after tomorrow, then I am not off again until Tuesday. Go figure.