First thing to do is select Easy difficulty. I could probably end the solution right here because the game is laughably easy on this setting and it is almost impossible to lose (I beat it in like 10-15 minutes). There is only really one spot that may be a problem, but I'll get to that in a second. You may want to make at least 1 of your saber crystals the Healing one, but I'm not sure how much of a difference it makes.
Assuming you've already completed the main story, your force powers should be well upgraded and you probably found some health upgrades along the way. If you haven't, don't stress it, because I've already stated, the DLC isn't that hard. The only spot that could be trouble is the part with all the electricity. Not because it will shock you to death (it barely does any damage at all), but because it is easy to fall off the platforms if you are not careful. I did it a hand full of times when playing through on Unleashed difficulty. There are a few generators where you need to force blast the side open, force grip the power supply to disconnect it, and force blast the other side to exit the generator's interior. You only have a short time to pass through before the power supply reconnects and restarts the electricity, so I dashed through to get out of the way. Unfortunately this sometimes resulted in me flying off the edge to my death or falling into a small crack between the generator and the platform. Just be cautious here, you might not even need to dash because the electricity barely does any damage.
The spot where I took the bulk of my damage came from the battle with the AT-ST, but that was still only about a quarter health and it is easy to regenerate. At this part just keep moving to avoid gun fire and throw your sabers at it. When they start launching rockets at you, use your force grip to redirect them at the AT-ST.