I have my customers put the parts in a seal-able bag (like a big Zip-loc) and drop it in front of my garage. I put out a wire bin on a small table that is under cover. We may talk at a distance. They put any instructions in the bag. I wear protective gloves, wipe the bag thoroughly with a disinfectant, then it goes into an un-used, un-heated shop for three days (or longer). I phone to discuss choices of thread and quilting. After quilting, she picks up in the same way and she uses whatever method she's comfortable with to assure it's safe. I'm in Washington State where people are advised to disinfect anything that comes into your living spaces. And I have a hubby with some lung problems so I'm not taking any chances. So far no one has balked and everyone is dropping off. I do four quilts a month so it isn't a parade of customers. One thing that stuck with me was a statement that "if you overreact, you'll never know if it was the right decision. If you under-react, you will know immediately". Stay well and safe. And if you decide it's necessary to stop all contact, provisions are in place to provide benefits to self-employed workers.