If the thread is all loopy on the back, it is really easy to find the bobbin thread and pull it out in sections first. Once you've pulled out the straight bobbin thread the top loopy thread comes out fairly well. If you just don't like the design and the thread isn't loose, it will be harder to remove. In that case some people like to separate the layers and clip the threads as they pull the top away from the sandwich. Good luck and hopefully it is a small area?