I would do as others have suggested - find a community room, library, or maybe even a friend where you can lay everything out.
Count how many blocks you have and write those numbers out on a sheet of paper - 1, 2, 3 etc. then cut the numbers out and pin them to the blocks in order. I don't bother with columns and rows, that's too confusing. If there are 40 blocks, I write 40 numbers out. Once you have the numbers pinned to the blocks, take a picture (or several pictures) of it. Then when you get back home with your blocks, the numbers will tell you where the blocks go and you will have the pictures to refer back to.