No no.. never ever trim leafs my friend. Leave the leafs alone.. until its time to harvest.
Each leaf you trim, causes the plant stress. Why? Because, when you cut a leaf (or branch.. or anything else for that matter) off of the plant while its growing.. it reacts to the stress from the leaf/branch being cut off and then kicks into survival mode.. so that it can focus more of its energy and strength to recover.. therefore, stalling veg growth and or flower growth. It's counterproductive in other words.. your causing the plant stress and slowing things down.
Plus, the more you stress a plant.. the higher chance you have of it being male.. or turning into a he/she if she's already been flowering for a good time.
Either way, my advice would be just leave the leaf's alone until harvest.. then take them and make yourself some hash with them.
peace.