Tomorrow morning you should be sitting on the porch with Grandma sipping a hot cup of coffee watching for them to see what they do and where they go, specifically what big trees they walk past. If they don't show then at that time she could point out where she sees them exactly. It sounds like you are planning to only set up the stand Saturday morning. If you think you will have plenty of time to hang it well before they would go by then do it that way. If not then a couple hours after they go by tomorrow sneak over and get the stand up as quietly and as scent free as possible and get out of there. That's probably how I would handle it, knowing they are already past and bedded rather than have them come early and catch me setting it up. Hunt with Grandma's confidence Saturday morning and good luck!!