You can’t cross thread a spark plug with your fingers, at least not to the point of doing damage. If it is just getting started and you can’t turn the plug with your fingers, then back it off and repeat Bill’s advice above.
If you are using NGK or Denso plugs, do not use anti-seize on them. They have an anti-seize plating that is not compatible with anti-seize compounds. If you are using another brand, you will need to check their web site. A general rule is that if the threads are silver, don’t use anti-seize, if they are black, use anti-seize. That may not be universally true though. Champions are silver and I would use anti-seize on them.
If your spark plugs are in holes that make it difficult to get your fingers on them, then I like to use a 1/4" or 3/16" reinforced tubing, like fuel line. You can get it at any parts store. Cut about a foot of it and slip it over the contact of the spark plug. Now you can guide the plug into the hole and start threading it. You can only go a few turns before the resistance gets to be too much for the tubing to turn the plug any more. It will not start threading in if the threads are not perfectly aligned.
Once you have two or three turns, you can switch to the socket. Put an extension on the socket and the plug should turn easily with your fingers until it bottoms out. It’s not a solid hit, but you can tell. Turn it as tight as you can with your fingers. Now put the ratchet or flex handle on the extension. If you have both, use the flex handle. Not the position of the flex handle and pick a point that it would be pointing too that is about 3/4 turn (270 degrees) from the start. Now turn the handle to that position and the plug will be just right. If for some reason it gets really hard to turn and you have gone past 1/2 turn, it is OK to stop.
Note: I’m pretty sure your plugs have a gasket on them. It looks like a metal o-ring that can be removed from the plug. Do not remove it. If you are doing an engine that uses a tapered seat instead of an o-ring, then you only turn the handle about 1/8 th turn.
If you use a torque wrench, still use the 3/4 turn as your guide. If the torque wrench doesn’t click or reach the desired torque, stop at the 3/4 turn anyway. If it clicks a little before, then stop there.
If you put any oil on the threads, which I would not do, then you probably will not reach the torque before the 3/4 turn.