I know this is an older comment, but I think it is an important point.
My wife has used Duolingo's Italian app, which gives you nice, crisp, 'standard' Italian. The result is that when we went to Italy, friends had to speak very slow and clearly for her to have a chance at understanding anything. Sometimes, they'd just switch to English.
The thing is to let yourself be frustrated and then move on. The first time I had to frame a wall, I was tempted to shoot myself with the nailgun halfway through. It's how learning is.
But think of the day you'll be sitting in a pub somewhere in the West of Ireland and you overhear a conversation and are able to follow along.
Pain of Duolingo Irish learning? A lot.
Being able to actually understand spoken Irish? PRICELESS.