I started as a BLM and thought it was pretty easy. Its basic rotation is pretty simple - fire until oom, then ice to recover. But it can be a bit tricky if you want to get the absolute best out of it at higher level as timing is everything. And there's not a lot of mobility, though most of the time you don't really need to move at all - it always amuses me to see a bard running around like his ass is on fire when there is absolutely no reason to.