Transitioning to this profession.
So first thing, if you character is not level 80 yet (or does not have chrono), the leveling with a mesmer IS more difficult than with most other classes. And in general, because mesmer has the absolute worst DPS of all professions, it is a bit more difficult in solo environment.
However, applying alacrity and quickness makes up for it greatly. So in any group environment, a chronomancer is really amazing (but only one, 2 chrono in a group of 5 is a waste). You won’t have the damage of other classes, but you will improve their damage significantly.
You can find online the ideal rotation to apply quickness and alacrity. It is not extremely difficult, but you need to know it. Note that 100% uptime on quickness does require some gear investment (and/or a revenant in your party for boon duration).
I don’t know if this answers your questions.