Well, if you aren't, work on keybinding everything. It makes the amount of skills you have seem less overwhelming

What I did, as a Guardian: I taunted him to pull him, threw my lightsaber to get a fix on which one was the actual Emperor *sometimes the circle was a little hard to see amongst everything else* and waited for him to start casting force storm, to which I interrupted by leaping at him. T7 was able to clear out the first wave of clones by himself using his AOE tanking abilities and DPS stance. At this point you have to use whatever heavy DPS abilities and cooldowns you have to get to phase two, which is when another set of clones appears. At this point I force push the Emperor and AOE the clones, then get behind a pillar cause of the death field aoe. By this point T7 is in rough shape. Jump back out, kick the next cast and take him to phase three. On phase three, T7 was able to hurt the next wave of clones and I finished them off with Force Sweep. He casts an ability here, its something like Force Wave or something. Something with Force in the name that isn't Force Lightning. It is a really long cast. On his first cast, Force Stasis right when the cast is about to finish, then kick the next one, also at the end of the cast. This took me several tries and a little luck was involved. By the way, if you are having problems with getting T7 some gear, the little puzzle on the main floor of the temple opens up a box with some greens for him. Not a full set but better than most of the items you can get. All you have to do is change the emblem on the ground to an imperial emblem using the panels on the backs of the pillars.