The younger the bird, the easier it is to remove the innards. And if you isolate the bird and stop feeding it the afternoon before, but give it plenty of water, there's a dramatically reduced chance of mistakenly contaminating anything because the intestinal system essentially cleans itself out. And if you do accidentally pierce the gallbladder or something else, you just have to wash the meat/carcass really, really well. You won't ruin the meat unless you soak that carcass in "filth".
Well, your description makes me feel better. Now I will have to find some kind of diagram that will show me the different parts of the chickens innards, so I that I will know what they are called and if they have to go in the garbage or not.
My chicken that I have eaten before have either been bought in a store, or from out of a restaurant, so I didn't have to worry about those.