i am so sorry you are facing that decision. it's never easy. i had to euthanize my dog at the ER vet saturday about 3am. he had been having seizures and they kept increasing in frequency and severity, and he got to the point where they wouldn't stop. it was time.

i, too, have really never been able to be there when it's done. they said either way is a viable option, so don't feel guilty if you choose not to....

again, my heart goes out to you.