I do not think we are qualified to use that handbook unless we are Veterinarians...
I'm sure many people aren't, but if you can weigh your bird, read and do simple math, I think you can. If I had known about that link, I might have been able to save a sick bird that was prescribed the *wrong* dose by a vet. I have also seen many posts that tell people to give the wrong dose of medicine and sometimes they tell people to give things that can be toxic.