I leveled up LTW ARM FSH and MIN all along with my GLD. Just for making my own gear and be able to meld. Anything else I needed I bought with money that I had made from selling items that I didn't need. Heck I also bought up people greatly undercutting prices and reselling them at the normal prices, made a ton of Gil doing that. Buy low, sell high.

Actually my ARM is a higher level than my PLD.