Ok, wanted to post with one thing I noticed missing from this guide and game in general. And that is how focus target works. I'm an interweb noob, so I don't have photobucket and that stuff or I would make screen shots. I will attempt, however, to explain how it works in text.
First off. Go to preferences, at the bottom of the preferences window you will see a tab labeled key bindings. Once in key bindings, go to Targeting.
Once in targeting, you will see the fourth option down is set focus target/swap focus target. This key combination (whatever you choose it to be) will allow you to choose who your focus target shall be. Once you have this established, try it out. You can use your companion even.
If you have done this correctly, you will see a new window pop up above the right side of your lower quickslots, between your quickslots and minimap. This is now your focus target.
But wait, there is more.
Now go back to preferences, keybindings, targeting.... and now scroll down. Second from the bottom will be focus target modifier.
THIS IS THE IMPORTANT PART.
Whichever key combination you choose to be focus target modifier will allow you to cast spells on your focus target without switching targets. This is especially important for any healer.
If you're doing it right, your cursor will turn purple when you're holding down your focus target modifier key.
So, for example. I have my set/swap focus target as alt+F.... and I have my "G" key as my focus target modifier. Once my focus target is set, all I have to do is hold down my G key, and any spells I then cast that are beneficial will be directed toward my focus target, without my having to press group member window, mouse, or do anything else.
Just thought I would share in case any were not aware of how it worked, and thought it maybe could be added to the sticky already present.