What should I do now that I am thoroughly convinced that the constructor has made an error somewhere?
Walk away, do something else for at least 30 minutes, then come back and start over with a fresh copy of the puzzle. Assume nothing. Test everything. I can assure you wholeheartedly that the numbers in the rows and columns are completely correct and that there is a single, unique solution. This puzzle has had more testing than any other puzzle in all of Geodyssey.
This thing is driving me crazy and I am desperate and stuck. Now what?
Punch “nonogram solver” into your favorite search engine. There are many free online apps that will solve these sorts of puzzles for you (some of which I used to check the accuracy of the construction).
I'm done. What am I looking at?
The first letters in the words of the puzzle title are a hint.
I can't read it. Now what?
Pencil is sometimes too light to scan correctly, especially if you’ve made a bunch of pencil marks in the white spaces. Increase the contrast in some way – going over all of the shaded cells with a black marker works really well.