I think the answer is work work work. I got my dog as an adult and she had no real skills[ecape artist not withstanding] but a great disposition. I repeatedly exposed her to situations that might spook her. We started with strong obedience and then to simple tricks. That`s when I discovered she worked for food. We then moved on to specific jobs to help with my disability.
I worked for hours every day with my dog. Always patient. Never scolding. Over and over u ntil she got it right.
Dogs love to please us. They love to work. A strong emotional bond and a strong work ethic for you both should see you through.
Best of luck