As Trident2e said, get there nice and early, but make sure they stamp your ticket with 'Priority'. I do it whenever I fly with Ryanair.
Oh yea, and if they put two stairs up (one at the front and one at the back) then go for the back stairs, the front stairs are the busiest. And if there's someone standing the way, pretend your blind and push them out the way.
Hopes this helps
"They have lady pilots......... they're not that good, but they have 'em"