Place some sort of pedestal on the ground, so the original mainboard wouldn't hang from the cables. I'm using a cardboard box in the photo.

Now you can review all the components you need to move to the new mainboard: 1. DDR memory stick (yellow arrow), 2. small Parallel ATA solid state hard drive (green arrow), 3. power supply converter and connector (purple arrow) and 4. white flat cable (blue arrow) for "power button" header.