It may sound corny, but for me, I've got to start with an organized workspace (those who have seen my garage will laugh hysterically at that comment). I just set everything up on the kitchen table; relevant printed tech manual pages and tools at the ready.

Beyond that, the first step is to remove the battery; on the bottom, slide the battery engage latch and the battery pack will pop free. Rotate it up and out of the unit, and set it aside.