Impact gun is the best. Otherwise, if you are by yourself, pull the cover off the fan shroud and put a crow-bar in the fan. Use that to hold the motor. If you have another person, you might be able to have them hold the motor while you turn the wrench.
On the trans, you can take the fenders off, and maybe get to it, but it would probably be easier with the trans out of the tractor.
BTW, sorry I didn't see your post asking for the enlarged pic. I would have provided the link.
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