The only thing that confused me was it asked what the issuing authority of my passport was, and what city/state it was issued in. Nowhere on the new passports does it state or city it was issued in. The application doesn't reflect that, which made it a bit annoying to try and fill out. The application is fairly straight forward though, it's not really too confusing. They need to allow more room for writing your travel dates though. They want to list the dates, length, place of travel, and reasons for travel within the last 10 years! For me, that was a huge amount of things. I couldnt fit it all. Even the last bit of the application where it gives you space to clarify anything...it didnt give enough room, either.
And it asks your sponsors name..twice, which was mildly annoying. I don't see the point in asking the same question multiple times. All very minor annoyances, though! Other than that, it's really straight forward and simple. It just seems much more stressful when you're in the process. Once it's done and dusted, you'll look back and think "

I cant believe I stressed so much over filling it out!"