1. What was actually meant is that you have to go into the system BIOS and designate your ssd as the primary boot drive instead of the hard disk drive. You don't actually have to change the location of the drives inside your pc case.
2. You can install games on an ssd. A clean install is the preferred method.
3. Use the free Samsung SSD Magician utility and a USB flash drive to secure erase your 830.