Personally i wouldn't use a 30W iron. It is certainly powerful enough. i think too powerful.
I like to stick with my 12W weller for delicate work, or an 18 watter for a little more juice. You can risk buring the PCB with more power, especially if you are a beginner and tend to be slower.
If you overheat the PCB the tracks can lift. Also, compnents can be damaged obviously by too much heat.
give the iron a try, it will certainly work, but be careful to be quicker and not to overheat things.