I here that.. There is a good chance you wont have to. I've seen my guy standing on his head working on commerical lawn mowers so he wont have to pull the motor.
Do your homework first though on the side effects. I'm a Briggs guy so I dont know first hand, but there seens to be some side effects and someone may need to correct me, but when modifing the Honda you may have idle issues, it sounding different, and not reving up as far as it use to.
One thing to keep in mind, a rev kit alone does not give it anymore power. It just allows it to safely rev higher if its capable of doing so. If your getting say 4000-4500rpm max right now, a rev kit wont make it rev any higher.
Frank