It ended up being a really busy day (had some other stuff we also *had* to take care of), and by the time we got over to the big box home improvement store to get the sharpening stone for the blade and came home in traffic, it was already dark & the girls had already put themselves away for the night.  We are going to do it tomorrow after the girls get up and run around a bit and we see how they are doing.  I just keep hoping they get better, but I know it's not going to happen.  We have a cone now (picked up a traffic cone thingie) and a sharp blade.  
I saw a video on Youtube about culling chickens with a cone & I thought I was going to hurl.  I wish there was someplace we could take them and pay to have it done.  ::sigh:: 
I do not know how I'm going to handle this.  DH has killed chickens before, but that was chickens that his family had raised for that purpose & they ate them.  He has never had to put down a sick chicken he was attached to.  Whole different ball of wax, I s'pose.