TO BE SURE ITS DONE:

Harvest time is NOT DETERMINED by how the calyxs look, but by how the trichomes look. The calyxs turning red will not accurately tell you when to harvest.

get a magnifying glass and look at the trichomes... they should be getting a little cloudy looking if they are ready for harvest. wait even longer (till they are cloudy and amber colored) for a stonier high.

Better yet, look at this guide.
Pictures on When to Harvest - Trichome colours - 420 Magazine

It explains the coloration of trichomes relative to harvest times and types of highs. pretty cool shit if you ask me.

good luck :thumbsup: