You should be able to get a flat head screwdriver under the lip of the boot and pry it up.
On my car, the rubber boot was stuck on the spark plug and the plastic pulled out.
I had to reach down into the hole with the coat hanger to try to get the damn thing off of the plug.
I took me over an hour of fussing around.
You probably need a new coil now, I don't think you can just stick the wire back into the boot.
I tried one more time. This time I was going to use my air compressor/tire inflator.
I warmed the car up till the engine was hot and not just warm.
Thing pulled right out. No need to use the air compressor
One of the spark plugs was very loose and another spark plug was Denso, while the other 3 were NGK??? Not sure how that happened, maybe last time I forgot to change one plug?
I wasn't getting any misfire codes so...
But should run better now.