Belated welcome from the Trouble girl.  As I read through all the great advice, I didn't see a couple of the small items I normally mention.  the first is you won't feel the relief of having made the decision to amputate until the the day you pick Riley up from the hospital and he comes bounding out ready for the trip home.  That was the moment I knew I had no regrets.  And by all means when he gets home, rest when he rests.  You will have a tendency to want to sit and watch him sleep.  Don't do it!  When he sleeps, you sleep.  It is very stressful on the humans the first two weeks and you will make it much easier the quicker you learn to rest.