I like to harvest during the hottest part of the day so the honey is more viscous.
As others have mentioned open in sections, ensure there is always an air gap at the top of the extraction tube and if it is not on a Flow base, there is a backward sloping angle. If possible use two keys to crack the frame. If draining into a sealed bucket ensure there is somewhere for the air to escape.
I leave the frames on the hive and visually check the cells are capped. (I couldn’t quite trust shaking a 3kg segmented frame.)
As it seems important to stress the occasional flooding issues by some, from my experience I have not had flooding issues in multiple extractions using the above guidelines. and will be doing an extraction off the hive in multiple ways as an experiment, just looking for the GoPro to charge. 
Good luck.
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