1) Inventory: stacks of (or reusable) attack adrenals and medpacks, cantina food, and enough stimpacks to last throughout the entire levelling process. Basically anything that can artificially boost levelling speed through higher damage output and lower downtime between mobs.
2) Frontloaded XP: Completing a ton of daily quests (the entire BH, Ilum, Sec X, Bels) and having the quests completed in my log. Log out in Black Hole before patch, then use shuttle around the various areas and turn in as soon as you log on. Complete enough quests, and you'll have almost a level within ~15 minutes.
3) Cartel XP boosts: Save up enough major and minor XP boosts to last you all the way. Remember to pop this before you do the daily delivery round though.
4) Companions: Choose the comp you're running with, gear it up and stick with it. Get HK-51 if you haven't already got it, especially if you're melee. Use a DPS companion as much as possible to increase output.