It might be helpful for you to mark all the block and rope sizes you intend to use on the YQ-drawings. At least, that helped me through a lot of issues, amongst others not ordering too much or too few blocks or the wrong size of blocks and ropes.
One of the things I found out building a model, is that planning in advance is a requirement, not nice-to-have.
It's a little bit like flying, you have to stay ahead of your plane by at least five minutes and just having a plan A doesn't suffice; one needs a plan B as well.