There are a few things I should add.
If you want to lay out the damp quilt on carpeting, put down a plastic drop cloth first to protect the carpet, then the flat sheet, then the quilt.
One thing I did not address in my post was the possibility of dye bleeds -- especially if this is the type of Amish quilt that has deep, dark, or jewel colors. Those dark colors are more likely to bleed.
Instead of Orvus, I would recommend using Synthrapol in the washing machine:
http://www.amazon.com/Craft-Synthrap...dp/B000YZ3UHQ/
Synthrapol suspends loose dye particles in the water so they rinse away instead of settling into neighboring fabrics. Synthrapol is widely available online and in quilt stores that cater to dyers, and would be safer to use than even Orvus. (Orvus is great for quilts when you are sure there will be no dye bleeds.)
If you are using a top-loader and notice the water changing color because of dye bleeds, you can advance the machine to spin to get rid of the discolored water, add more water and diluted Synthrapol, and continue washing. If there is a lot of bleeding, you can do this over and over until the water looks normal. Do this continuously to keep up movement of the quilt in the water, as you do not want to give loose dye particles time to settle into fabrics.
Be careful to not leave the damp quilt folded over on itself before drying. You do not want damp quilt fabric touching other damp quilt fabric for any period of time because this can allow dye to transfer. As soon as the final rinse is over, you want to put the quilt into the dryer or spread it out to dry.
If you have a front-loading washing machine, be aware that most domestic front-loaders do not use enough water to dilute dye bleeds. I have a small front-loader at home, so I take my quilts to the local laundromat and use their largest front-loader for the first washing of my quilts. The big front-loaders use enough water to dilute dye bleeds.