I've swapped a few civic transmissions and it isn't terrible, but it is a good deal of work. drmiller is right though, EX transmissions are desirable and I wouldn't be at all surprised if you could find someone with a CX/VX transmission who wanted to swap. I'd try that route first, but if you are planning on keeping the car for a reasonable amount of time, swapping transmissions would be worth it IMHO.
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