Regarding your q's, aside from an affidavit of loss, you need the bring a residence cert. & photocopy of your lost lic./or. My case, I wasn't required to undergo the diff. tests mainly bec. it was just a requesition for a duplicate copy. Maybe, ganon na rin sa yo. But they'll take a new pic kaya maha-hassle ka coz of the steps you have to go through. Grabe pa naman dami tao sa LTO everyday. They'll initially issue a temp. license, indexcard-size. You'll get the card after 3 mos. =)

Cheers!