Do you worry having it all cut out ready to go that there will be a mistake you haven't found?
I normally cut as I go, making one or two blocks then cutting the next lot, because I've made mistakes in the past and ruined a LOT of fabric. But I have one on the go at the moment where I have done exactly as you have... cut the whole lot out, put it in neat little piles, and I'm now putting it together. It's going great, so far no problems and I'm about two thirds of the way through. But the longer I go without a hiccup, the more I worry that there's a huge problem waiting just round the corner! LOL Oh my goodness... I've just realised I'm getting paranoid!