Just take a couple big light blockers from the top everyday. The plant can lose a few leaves without stressing. Some people want to go at it all at once and as few times as possible, but a big defoliation can take awhile to recover from, whereas just taking a few everyday shouldn't have any recovery time. Of course, you still have to lollipop. That's stressful now matter what so be thorough if you're putting her through it anyway.