They usually aren't attached per se, they fit in a socket that is snug enough to hold them. But the spark plug wires trap them into position. So you can go ahead and pull the spark plug wire off.
One thing to remember, when you go to replace the spark plugs you won't be able to see if they are cross thread in their hole, so DO NOT use a socket until you are sure the are properly seated and not cross threaded.
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