I just want to say this game is difficult. A lot of people are saying it's easier than WOW. Although I think it is the top raiders saying this. I doubt raiding will be as tough as WOW raiding (before it is nerfed), but some of these heroics areas are getting difficult.
The game is not easier than WoW when it comes to leveling (thank God). It's actually quite harder than today WoW, and probably on par with Vanilla WoW. It's not difficult either, though.
I don't have any idea how easy/hard it is for raiding, but I've heard it's not hard for good players.
Another thing that makes it more difficult from a Guardian perspective is the sheer number of useful abilities I have when tanking. My hand really can only reach over to the 6 key, and then I use keys like R, f, and v (for kick- but v is hard to stretch to). Targetting enemies seems more difficult than WOW too. And I have to manual use the mouse to click on some abilities because there just are too many. My brother was telling me how easy this game was, so I wasn't worried about tanking. But despite having the appropriate talents, I feel like I'm taking too much damage.
You've got a keyboard, not a joypad, use it !

Use combination key, they can easily multiply the number of keys available.
A setting that works for me : the usual ZQSD (or WASD for you QWERTY guys) for moving.
Then the abilities I use most and which requires the most reactivity are put on 1, 2, 3, 4, C, F, E and Q and end up on the main quickslot bar.
For the secondary quickslot bar I use Shift + the same keys, and for the left quickslot bar I use Ctrl + the same keys. Both are for for abilities I use often, but which need less reactivity.
Then I use Alt + the usual keys for the right bar and the abilities I use sometimes and want to have on shortkey.
In WoW I used Alt Gr + the usual keys for the last bar, in SWTOR I use them for the four companion abilities available on his/her own pannel (rarely need to use all of them, so I don't need to expand his/her bar onto mines).
For the abilities I don't use often and which requires no reactivity (like "back to the fleet" or so), I use the gaps on the bar (only 8 quick keys, so 4 slots available on each) and mouseclick them.
This amount to 32 shortkeys, which is plenty enough for SWTOR. I can't imagine how you managed in WoW if you had only 6 keys, even with the 32 I started to feel cramped when I still played it
