Find any place that has worms...and you can solo them by staying outside the spell range.
1) Find out the FARTHEST point you can cast from.
2) Cast your offensive spell
3) Back off immediately when it starts casting
4) As soon as you've backed out of range, move back into casting range
5) Repeat another spell, as when casting is interrupted, you can't cast for a few more seconds.
6) And just repeat this cycle.
It's kind of hard to perfect this cycle because you have to time it properly as to when to leave the AoE. However, I soloed Maze makers in the Maze at level 11 (just took a bloody hard time). I never touched the other side of the world, but i'm sure you could do some worm in La thiene, or even the Korrokola tunnel? (never been there).
Good people to party with for worms, Whms, RDMs, other Blms and rangers.
Whms and Rdms can heal you as well as cast feebing spells.
As for level 6-10 though. Binding and casting is probably your best best. I'd also recommend if you have the money to get orange juice and apple juice because at that level, one of those will pretty much fill a good chunk of your mp.