I'm playing it currently, first time, easy mode. I don't think you can solo this game, using the default build at least. The healing force skills are draining way too fast to endure long fights. Though here's the trick, you can survive a long time using medicine packs from the inventory while in the pause menu, one per turn.
A light story spoiler below, read or pass.
Also, there are parts with weird difficulty jumps, like the mercs outside the Crystal Cavern of Dantooine, just before they start the Koohnda battle, a bunch of 6 wiping you clear and clean within a few seconds..I had to send my two friendly units as bait while throwing all the bombs I had in store to win this one, maybe a bugged battle?
End of spoiler
So if you ask me, not possible unless being very patient using med during pauses, avoiding tough battles.
Post edited February 14, 2014 by koima57