The Good Friday Agreement was signed the year before I could vote. I'm in my mid-30s.
So my memories from my days as a non voting teenager are being stirred. Rev Ian Paisley (recently deceased) rings big loud bells with an unpleasant clang.
My media experience of Northern Irish politics over recent years has been fairly quiet as Stormant gets suspended from time to time, and currently is because of the wood pellets subsidies scandal which is the only context in which I have really heard of Arlene's name- not really connected to her social values/ moral stance.
I'm married to an Irishman (Republic) which has increased my understanding of the historical Irish position as part of the UK, and its quest for independence. Growing up on the same island as Northern Ireland, his knowledge of the Northern Irish troubles wasn't much more sophisticated than mine, although with a different bias.
So I'm not completely ignorant. But what use is that knowledge when I walk into a polling booth and have a choice between Con (safe seat by large margin), Labour, Lib Dems and Greens. The only practical way that I could apply an influence of the DUP onto my vote is to stand for them, but I'd get two less votes than Elmo because DH certainly wouldn't be voting for me. 
I don't get any influence on any agreement that Theresa May makes with the DUP any more than I did when by-elections pushed John Major into a minority government 92-97.
So I have a reasonable (by English standards) headline knowledge of Northern Ireland and its politics. Even if I actively researched the politics of Northern Ireland, Scotland, Wales and any other minority parties of the UK, that still makes no difference on where I place my cross against Cons, Lab, Lib Dem or Green. Is it irrelevant? Certainly not on a national scale, but it is beyond my personal sphere of influence.