Now that advanced preparation is out of the way, you can now start packing.
Electrical cords are usually a jumbled mess that's hidden from our sights. When you're moving, however, all those wires will be in full sight and it will help smoothen the relocation if you label them or use a colour-coded system.
For instance, you can place a blue sticker on a computer mouse and another blue sticker for its electrical cord to help speed up re-assembly in the new office.