I just brought all my classes up together when I did it and it still was a pretty fast process, especially now with Grand Company supply missions and the new Beast Tribes. That being said, Byregot's Blessing is an awesome ability and well worth rushing your CRP to 50. Get CRP to 50 and then do the rest all at once might be a great strategy.

As far as BB goes, it basically works like this...after you have used Inner Quiet (an ability all classes have), with every successful Quality Touch (Basic Touch, Advanced Touch, Hasty Touch, etc.) you receive one "Stack" on Inner Quiet. Not only does each stack give you a bonus in Control (which affects quality)but each one give BB a 20% boost in quality to its 100% base. So, at three stacks (3 successful touches) BB will give a 160% quality boost (100%+20%=20%+20%) 5 stacks will give you 200%, 7 stacks 240%, you get the idea. Mix BB with a Great Strides (doubles the next touch), Innovation (50% Control Buff), along with "Good" and "Excellent" conditions during the craft and the potential of BB is quite impressive.

As you saw, the number of stacks you can get is the key. Remember that. In some cases is is better to try for a bunch of Basic Touches and some Durability recovery than larger Advanced Touches, just to get the stacks up.

I hope this helps, and Good Luck!

Arisu