I’m in a similar position, where I’ve never had the opportunity to formally do accessibility testing.
I first got interested in it seeing @rightsaidjames gives his talk at testBash Manchester 2017 - https://www.ministryoftesting.com/dojo/series/testbash-manchester-2017/lessons/accessibility-testing-crash-course-james-sheasby-thomas
From there I downloaded WAVE as a plugin for Chrome to have a play with it, knowing I won’t be using it at work (I don’t test UI). But otherwise not been able to do any accessibility testing.
I love the idea of doing it, it’s just the lack of means to apply it.