lol, that's what Quick Travel and Emergency Fleet Pass are for
Quick Travel will get you to a Cantina (assuming you unlocked one) or the Spaceport (so you can get to your ship, which counts as a Rest Area). Emergency Fleet Pass will get you to the Fleet, and there's a Cantina in there.
I'd like to describe the Sith Warrior end-battle, but I'll do it in Spoilers, so you can choose not to read it.
Click here to see the hidden message (It might contain spoilers)
You confront Darth Baras in the Dark Council chamber on Korriban. Like other bosses, you have to defeat him more than once, with a dialogue in between fights (and a chance to heal up). The first part wasn't too hard; my usual Tank tricks, with a DPS companion, brought him down quickly.
But then during the second fight, he uses a move called Emperor's Voice. This ability hits with force, taking 11,000 hit points (I only had 13,000 at full health). So it's insta-kill. After a few deaths like that, I saw that Emperor's Voice was a channeled spell, so I could interrupt it with one of three powers (Choke, Push, and Backhand). And if he did it again, I could just run, with my Healer companion out to heal me up). After a few tries, I was able to get it done and kill him. Good times.