I've done this once and my only comment is that I had to pull/jerk very hard, much harder than I'd have thought was reasonable. To make matters worse when the screws were out it didn't feel as though the box was tight/wedged but rather that it was held up on something positive that was meant to be removed. Having checked and double checked all the screws were out I removed a number of other dash parts trying to see what was going on - all to no avail. In the end I simply pulled VERY HARD, align your forearm with the glove box door to spread the force over the whole width of the door.

BTW if you're glove box door makes a strange noise on opening you may be able to fix it by lubricating the dashpot damper which is accessible when the glove box is out.

Good luck,

Peter