If you are making multiples of the same block (ala Judy Niemeyer), you can get plastic template material and make templates of the different pieces that you will need with the needed extra seam allowance (and I do more than 1/4 inch just to be safe). She usually tries to have the pieces cut using strip piecing (i.e. with two parallel straight lines a certain distance apart).
If you are making many different blocks, it can be a bit more challenging. I do try to hold it up to a light to make sure all the parts are covered and then carefully fold it back. Sometimes I will pin on the seam and with the seam and fold it back before sewing to make sure it will be covered too!