Not a big deal. This is a common Subaru problem, with the driver's window switch wearing out.
The switch on the driver's side is pricey, as are most Subaru parts---about $150 bucks. You can try a wrecking yard, but test the switch first, because most of them are worn out if the miles are anywhere near 75K-100K.
Labor is easy, about 1/2 hour to just pop it out and put a new one in. So if a dealer does all the work for you, figure $225. If you scrounge for a used switch and put it in yourself, that's way cheaper of course. Mabye you could get lucky and find a used switch on eBay. You won't find these aftermarket I don't think. Dealer only item--IF they even have one.
GETTING THE WINDOW UP -- have you tried really pressing HARD on the switch---don't worry about breaking it, it's already broken?
if that doesn't work you'll have to remove the door panel, disconnect it from the regulator, and then prop it up with a piece of wood or something.