"Do as previously suggested w/ asus backtracker and you will be fine.
To be a little more concise follow these steps.
1. Use Asus backtracker to back up the system to a flash drive (16GB minimum). Power off system when finished and remove battery.
2. Open the bottom cover on your laptop and swap out the mechanical HD for your SSD (i.e. use the same bay). Put battery back in and power on with your flash drive inserted.
3. Once backtracker has finished restoring your system you can reinsert your mechanical HD to your other HD bay if you want to use it for mass storage. Once again power off your system and remove battery first before doing so. The necessary mounting screws for your hard drive should have been in a little bag taped to the cardboard inside the box your laptop came in. Reassemble your system.
4. Not sure if this is mandatory on all systems but I had to boot to BIOS before I could get Windows to recognize that the mechanical HD was installed to the secondary HD bay.
5. Enjoy your SSD! I have the same SSD that Cronik does and I have to agree with him that this laptop with a decent SSD absolutely SCREAMS. Most applications open instantly and all run buttery smooth. The longest it takes for me to load any program is 8 seconds (After Effects, which previously took between 30 - 45 seconds), and I am not kidding in the slightest when I say that this laptop now goes from completely powered down to a working windows desktop in about six and a half seconds on Windows 8 (with Start8 installed and booting straight to the classic desktop)." Nillaz
I'll try this. The other method didn't work, had to factory reset from the HDD.
My only question with Nillaz' method is whether i'll be able to connect the original HDD in slot 2, and format it while inside the middle slot, or whether this will again crash the computer totally. I read on this thread that people had success formatting their old HDD and using it as a secondary data disk by connecting it externally via an USB.
http://rog.asus.com/forum/showthread.php?37714-G750JW-adding-a-SSDMy question is therefore if i'll be able to format this disk while inside slot 2? (Assuming now the procedure over works. I will try.)