Was going through my old LEGO crate and was rebuilding an old 90's set (LEGO 6592 Vacation Hideaway) and I haven't felt that dumb in ages. It doesn't tell you what pieces are needed for the step, you just have to compare and hope you noticed all the new pieces. Plus it never changes angle so if you're trying to place something exactly you need to really pay attention. How did child me put up with this? Didn't know who to vent to with my dumb problem, guess I'm an old man saying "you kids don't know how easy you have it now".