You don't have to remove the bumper. Remove the front skid plate, and then you can fit your hands up behind the bumper. I believe I used a mini ratchet, 10mm socket to remove the nuts from the 5 studs. The studs break off very easily if there's any rust in there, so be gentle. Also watch out for the little rubber spacers between the two parts. They are easy to lose.

98 Montero, 184k.