Never had an rog laptop, but it should be quite easy. In my laptop which is a common asus one, i jsut removed the prvious one and mounted the ssd, just 3 screws.
http://rog.asus.com/111602012/g-series-laptops/g55vw-upgrade-guide/ check out this link, there is everything you need
| Maximus V Formula | i7-3770k | 16Gb Dominator Platinum | GTX 780 | Force 240Gb | 2TB Caviar Green | Obsidian 650D | AX850 | H100 | 24" LED VS247H |