The only thing that makes Ltw a bit of a rigor is when you use the leather triple turn in group rather than the 80 dura. It's hard to keep the leve current when doing 40 dura synth and still turn in HQ. The 50 skill is the core skill to making 40 dura HQ. It's the ideal reward skill for that craft. It's also a great craft for people who would rather kill their mat's over gather. You need to know your mobs though.
In terms of cross classing the components, Blacksmith is far and away the most difficult as a launch craft.