Give yourself a hug from me. We feel for you as we are dealing with grief and loss this year too. I agree with all the suggestions posted so far. Tying or tacking with your machine is a quick way to hold your sandwich together. You can use a soft blanket (old or new) or something like warm and natural and it can be tied pretty far apart. Folding the back over the edge is pretty and fast. If possible, allow enough for a double layer of fabric or your edge will fray out within just a few years.
Rag directions have already been given. Good luck! I would help you if I were closer.