I find using an Add-a-Quarter Ruler very helpful with paper piecing. After 1st sewing with right side of fabric facing you, fold paper back and cut the 1/4 inch using the ruler. Put second fabric on right sides together matching fabric with 1st fabric cut. Sew on line. Fold paper back and cut 1/4 seam with ruler. Sew third piece on matching fabric with that cut.
I hope this helps.
Jean