I use my guest bed for sandwiching quilts for which I use quilters' safety pins. It means bending down a bit so I take breaks. If the quilt is big, I quilt it in sections and then sew the sections together. The other thing I do is use a big table at a public hall. The folks there are happy to have me come for an hour or so at no charge when no one is using it. Our public library also has times when tables in its meeting room aren't being used and will happily let me use those.