Washing times are greatly reduced, when using products like Perma Wahs, to 15 min. total for full archival standards.
As for the use of a hairdryer, its pretty easy. After squeeging both sides, back first, place on any surface, although screens work better. Put the dryer close to the surface, and go across it back and forth, up and down. You will see the paper start to curl at ome point, at hich time you should turn it over and do the same process with the dryer. Continueing to flip the print over and over, you will end up with a flat print. Also as you work your way down the rint, grabbing the top edge and curling it toward the bottom will also help counteract the curl you got when doing the other side.
Had to do this for many years when a rush job was coming down to the wire.