It is not bad it just makes the quilting a little less easy to do. Instead of going through only 3 layers (top, batting, backing) you will be going through 4. It is advised against in traditional quilting because usually seam allowance are pressed to one side making it 5 layers to go through. You should be just fine. You may not be able to get really small stitches but consistency is more important than stitches per inch, especially when first learning.