i found that defeating hanharr wasn't all that difficult to do; just make sure mira is a jedi, has a strong lightsaber(doublebladed)and far developed healing powers(masterlevel) and enough medpacks/lifesupportpacks.
then just hit him-heal-hit heal-hit heal and so on the only two 'people'that i found were more difficult to beat is the large monsterbeast and kreia
I also equip two melee/lightsaber -combatants in the party and one ranged.
ranged mostly; mandalore,all the droids(although i hardly use them),atton, bao-dur