I've thought about pursuing the same. I'd be interested to know if anyone has any insight on this.

I know a lot about service dogs because I'm in the LONG process of getting one. First, you need to know a few things, it costs a lot of money. And there are 2 options train it yourself or have an organisation train it. If you train it, the dog will have to have all basic commands down solid. Then it will have to have at least 2 tasks it does to mitigate our disability, ex, DPT, and retrieve. but it is recommended they know more and continue learning. It will take about 2 years to completely be trained. so after that doctor/family/friend will give your dog the final test called the Public Access Test. it is recommended to record your dog doing this. A dog can take it is as many times as necessary. But they have very high standards.https://www.psychdogpartners.org/resources/public-access/public-access-test
Also please remember you can't just go online and "register your dog as an SD" finally you must be prepared for people to question your access to stores, restaurants Exc. so you should know your rights, also if someone pets your dog in public nicely ask them to stop. you should always know your rights. https://www.ada.gov/regs2010/service_animal_qa.html