For the average joe (me, others) it is hard as hell. But you will get it eventually like I did. And in doing so, you will feel a sense of accomplishment in the game, so stick with it.
Didn't find many (any) helpful videos on the web, but many good pointers in this and other TOR IA forum threads.
What worked for me (Concealment, lvl 33 at time of kill) was to use Kaliyo in Sniper Sight stance and as passive for opener. Pop Stealth and Sneak, then get point blank on Jadus and open with Debilitate or Flash Bang. Run like hell off Jadus's platform to the next-lower level on the left side ( left when looking at Jadus from below him). I found one single computer console that los'ed his casts reliably on that left side, that's why I recommend fighting him there.
When Jadus awakes and you are out of line-of-sight behind that computer terminal AND Kaliyo is still passive, he will 100% of the time get off the platform and down to you. Now put Kaliyo on attack. Exact rotation goes out the window, but your strategy is to:
-stay close to him and that console- avoid running around the whole place
-keep aggro on yourself by dps'ing and let Kaliyo do supplementary dps
-interrupt his casts by los'ing him around that computer terminal or using Distraction
-when you have an stun off cd, use it to interrupt a cast. then either: heal yourself or Kaliyo, or (if everyone's health is reasonable) instead hit him with unanswered dps
-try and keep Corrosive Dart up on him
By shutting down the bulk of his damaging casts and doing damage and healing when you can, you WILL come out on top. The tipping point for you will be when you learn how to manage the los game and still do damage and effectively keep yourself healed.
Enjoy Chapter 2!