Yes, you need a presser foot that will give you an accurate 1/4". And then, practice, and practice some more. One of the first projects I made when I first started 20 years ago was a baby quilt with 3-dimensional pinwheels! I must have made 100 blocks to get 20 the same size. But I learned so much doing that one quilt. I would also suggest making a bunch of 9-patch blocks. That will give you the needed practice to get that seam straight and at 1/4". It will be easier and less noticeable to trim down the blocks to put them together into a quilt.