Mileage may vary depending on how much you give the PCs. I'm sure that won't overpower them by any stretch of the imagination.
I know Adventure 1 might have some rather difficult encounters for the relatively low-level PCs if they are headstrong and don't think out their actions. Don't worry about giving the PCs a bit extra to work with. Otherwise just try to be an understanding and nice GM...
Personally, I plan on repeatedly murdering my PCs when I eventually run it.