If you use a hoop or frame, be sure to leave some give/slack so it's easier to maneuver the needle. Not quite as baggy/saggy as a hammock, but it does need some 'sag'
For some reason, although now I have no idea why I thought that - I thought that the fabric was supposed to be pulled tight as a drumhead in a hoop or frame - and then I was wondering why it was so hard to make/do the stitches.
DUH!