Skinner knows that he and the Oilers as a whole need to be better, and he's putting in extra work to get there. Since he was taken out of the crease last playoffs against Vancouver, Skinner feels like he's proven he's better now.
He doesn't need to be a world beater, just make the routine saves, and the result of the game will be on the entire team. Right now Skinner's save percentage being 20 points below league average is clearly hurting the Oilers, and hopefully, it turns around soon.