Cutting leaves

How many leaves are ok to cut? I think some of my plants are getting blocked from the light, will cutting some of the leaves of my bigger plants affect their health? I am almost ready to go into flowering.
 
Be careful when doing so, your fan leaves are your feeders so you don't want to remove too many, if any at all.

Usually a week before big plants come down people strip the fans off to let the light hit them for the last 7 days, just a tip
 
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