I feel your paid. I have the same machine that you have (not that it makes a difference) and I had the dickens of a time learning to do corners. All I can say is practice, practice, practice. I would suggest cutting out a big square of scrap fabric and then going round and round and round until there is nothing left. Also, watch the blade, not the needles. When I watch the needles, I mess up every time. But if I watch the blade, the needles do just fine. I had trouble once I got multiple layers with the fabric stopping on the curves and then I'd get loops in the bottom where the sts were closer but the thread length between them was the same. For that, I learned to go slow and make sure the fabric keeps moving. If I think of anything else, I'll come back and add it. I really do feel your pain, but you can learn and you'll be so proud of yourself when you finally figure it out!