ONE! If you just bought rechargeable batteries, you need to charge them. Many rechargeable batteries come in a discharged state. It may seem silly, but it's true.

TWO! Make sure the servo connectors are as close to the board as possible. It may be hard to push them down. My hands are soft, so I thought I had gotten as for as I could, but there was a gap between the connectors and the board! Cover up the pins. Keep trying. It might hurt if you have soft hands, haha. I shouldn't have quit guitar lessons.

I think they're okay, now. Moving on from step #53...