Trimming & pruning?

Hello. I have 55 Armageddon about 4-6 weeks away from finishing, the buds have jsut started to all form up and resemble the fiished product. they are dripping in THC but i have a lot of bud formation all over the plants, lots and lots and leaves that i think are blocking the light. I have been trimming as i go and the plants seem to like it a few days later, reacting well and with energy but now I am wanting to take more drastic leaves off, higher up the plant, and those that are covered in thc? not close to the bud, bud all those around. How far into the plants life does it need to go to not require the leaves? I know they naturally start to die and turn yellow but i havent started to notice that yet? I know it may stunt them a little too, i can accept that, as long as they wont suddenly wither up and die! (pretty sure they will be fine but wanted to gather some intelligence first)