I did the basic target-cast-Citadel transport terminal routine, but since it takes awhile to recharge, I decided to save and load, which makes a whole lot faster. It is best to get all of them and go to the nearest terminal.
Also, it goes even faster to just load the game after you cast them, but if you turn off your console, you will lose your progress.
Just a little tip to make things go faster. Hope this helps :]