Breaking down your bubble - what's the best way?

I'm wondering if I'm damaging trichomes when I first put my damp paddies on the cardboard and start breaking them up with a credit card. Can I use too much pressure and damage trichomes? Would using toothpicks to break it apart at first be more gentle and possibly improve my bubble?
Also, after this stage what is the best way to get it to powder form without damaging trichomes? A sieve, sift, electric, or hand grinder?
Thanks in advance!

breaking up the trichs lightly with a card is not gonna damage them...the damage usually happens when you use the "pressing" screen too harD...its more a "blotter" screen....if you break up the bubble and let it cure properly ie give it enough time it will break up into a powder by itself