I speed pp piece....If all of your square in square blocks are identical sit down and do them all at once....the center and the 4 corner pieces...and then the next 4 corner pieces..... the same with your rectangle block...
If the fabrics change....I mark the back sides of the paper with the corresponding fabrics....
I also rough cut all of my fabrics before I start sewing, and group the fabrics with the papers and pin them together. You can print out extra paper and use them as templates...just make sure you give yourself a little extra fabric to work with and be sure and use the same side of the templates that the fabric lays against...or the angles will be wrong!!!