There are a few things I have told the ladies I am teaching to quilt.
1. Have fun.
2. When you are cutting your material make sure you are moving your hand up the ruler to keep pressure on it so it doesn't shift.
3. When you get ready to sew. I take my ruler and put it under the needle. Lower the needle down where it is just touching the top of the ruler on the 1/4 inch mark. Than I take a stack of post it notes and line it up with the edge of the ruler. That way they know exactly where the 1/4 inch mark is. It helps them.
4. Always set your seam closed with the iron. Than open your pieces and press the seam from the inside to the side you are going to send the seam allowance to. Some open their seams other go to the dark.
But always check you sizes. of each of the pieces when you sew. Also keep checking your seam allowance occasionally. Some times it will shift on you. One good thing to have is a good 1/4 inch quilting foot which a lot of machines now have.
Hope this helps.
Quilty Hugs.
Ann in Indiana