well i just finished the bombing mission after dying the first 3 times, lol.
The easiest way i found was to stay at the trainstation for a bit, until i got up to around 15 potions. Then i entered the reactor, and stayed on the bridge for a bit fighting the blue guys and the little floaty things. I stayed here until i had around 10 ethers, and still around 15 potions. After that, i went to the actual reactor and fought against those trucks for quite a while, basically until i couldn't easilsy level up(around lvl13). When i went to fight guard scorpion i had 5 bolt plumes, 10 potions, and 8 ethers. The battle was pretty easy, but it still took a good 10 minutes and bolt plume/thunder/limit break, repeat.
All and all it was pretty satisfying to beat guard scorpion and the first reactor, normally i can pummel through that section of the game in under 15 minutes. I've just gotten to the avalanche base, so i'll add any tips i find for really difficult sections.
Anyone want to clue me in on good enemies to steal/morph from?