My Chris had a PEG which means it was done endoscopically rather than radioscopically.
He chose a general rather than local anaesthetic but we had full faith in both the anaesthetist and the gastroenterologist performing the procedure.
I know that some here have had it performed radioscopically due to anaesthetic issues from low FVC. Chris still had reasonable FVC at the time. There are some good threads here about the differences if you search maybe in the PEG section, I haven't read much in there lately but I do remember some great stuff.
However, he was already dehydrated (they were great, on arrival they turned to me and said, should we put a drip in? I said YES PLEASE he is dehydrated before he started fasting), he was already in starvation mode as he had been eating so little and only weighed 54kg.
I believe strongly that if you decide you will have PEG placed, do it EARLY. Do it while your breathing is OK, while you are still in reasonable condition and weight. I really feel your body will cope with the minor surgery best then, rather than waiting til you NEED it.