Training parrot to be aware of windows?

I feel like me and my indian ringneck would have a lot more freedom if I could freely
move around the house with him, without worrying about him flying into a window
and badly injuring himself.

I've read that introducing him to windows beforehand can be effective but
my question is, what if it's not? It seems like a pretty big risk to take and in a worse case scenereo could result in a dead bird.