Since I always had the assistance of my wife (either tanking or healing), when I was bringing the job up, I would stop every 10 levels and learn all the spells that I could ahead of my current level. The amount of time spent capping my skills and learning my spells didn't bother me. It was all about having all the spells for me. I knew if I had all the spells I could know before I got to that level, I'd be able to keep evolving my spell setup as I reached those higher levels.

But each player is different on how/why they leveled their Blu in the manner that they did. Just don't let the times when you spend hours trying to learn one spell wear on you. Thankfully, for me, it didn't happen that often and I actually enjoyed spell farming (since I usually didn't have any other reason to fight certain mobs).

I'm currently only missing one spell, Tourbillion. Just not having any luck getting a Khimmy spawn in Nyzul.