On JCing. I'm not sure I'd PL it up just to make cash. I'm already seeing a huge decrease in demand for the eyes (boy did I milk that early on ;b), and the market for desirable cuts is starting to get pretty crowded. Maybe your server is diff, check the AH, but it's starting to saturate here. And it's pretty expensive to level because you need a lot of pre-BC gems that aren't very plentiful any more (which means that even if you can find them on AH, they cost TONs).

Having said that, I am going to PL my main (a mage) in JC. It's gonna cost me, but I just think it's the best profession all around now. There will always be a little money in it and the self-only stuff is pretty good. Tailoring has really left me flat to be honest.

Leatherworking isn't hard to PL, but boy does it cost. You need a LOT of thick and rugged leather, and much like the JC gems, the few people who are producing it definitely know what they want for it. I wouldn't recommend leveling it if your only reason is to make some gear. Just find a LW and make a deal since you'll be wanting quite a bit.