Question for those who work for the GUIDE DOG FOUNDATION?

I absolutely love dogs and feel a real connection to them. Most dogs love me and get along with me really well. I thought I could put this quality to use in a profession that would make a difference. I am looking into becoming an apprentice guide dog trainer. Is this a rewarding job? Is it frustrating at times if the dog just doesn't seem to be learning something? Does anyone know what positions like this pay? I live Long Island, NY. If you know anything about it or know someone who does it, can you please share your experiences. I have already looked at the website, but I'm looking for real life experiences, opinions and testimonials that I might not necessarily see on the website. Thanks!