I haven't made one, but I'm planning one. And I have done another quilt with 1.5" squares. My suggestion is do it in blocks, not rows. Sew your 1.5" squares into 4 patches, then 16-patches, etc, until they are a manageable size. Then, you can put the quilt together like any other, assembling the rows. I hope you have a design wall.
Biggest danger will be turning a block -I like to chain piece, so all the sections end up linked together, in the right order and orientation. That helps avoid flipping something. And mark the top left of each section, to help keep everything upright.