Well I have a few questions, regarding different parts of a system build

Hello,
I am having trouble reaching a standoff near the top of the case. I have an Antec One Hundred case and a Gigabyte GA970ADS3 motherboard. The standoff is at the top of the case, and is the middle standoff on that row. I can't fit my hand in there, and the screwdriver cannot lean in any direction to help the screw go in. Also I can't seem to find all the cables I need to hook up my hard drive and my DVD drive. I have the Corsair HX650 PSU and it came with some old peripheral cables that aren't used anymore. I found the SATA cables, but it doesn't have both power and data connectors. Do I need to buy some more cables?