For anyone seeing this for the first time, it might be best to read the "sequel" first. This is a prequel in that it takes place before the main story, but it also spoils a bit of it and was published later
That being said, if you really want to read this first, I don't think it should make too huge of a difference. What it spoils can be seen from a mile away if you just think a little. Maybe you'll miss out on some "OH. OOOOH" moments, but you can always reread a 22 chapter series