I agree with Chubby... there are plenty of ways to do it successfully. It's just a matter of preference. Personally I prefer to cut the plant into smaller sections, or whatever size is comfortable to trim, then I do a quick, rough trimming (pulling fan leaves off by hand first), then hanging that up. I've tried drying first then trimming, and find it to be more of a pain. All of the little leaves sort of curl in when they dry, but if you trim them right at harvest they're all sticking out. No right or wrong, just my preference.
And, I'd say if you're using a dehumidifier and you're getting your buds dry in 3 days, you might want to turn that thing down a bit. No offense to greentiger, but that seems too quick. I don't think the drying is going to be as even - crispy on the outside, maybe moist on the inside.
I've had to dry with no dehumidifier, and humidity that was higher than I'd like, and I've never had a mold problem. I've had mold happen at the end of flower, but never while drying. In my experience the more likely problem is drying too fast and making them crispy, crumbly, and harsh. Maybe I'm lucky, maybe it's the area I live in... but, that's been my experience.