I've only done Hondas but - If you're a kinda mechanic get a repair manual and belt or belts at autozone and follow the book. otherwise shop around for a mechanic as you can ruin the engine if you get the timing wrong while replacing belt or belts.
RepairPal Certified shops can diagnose and repair your 1998 Toyota Camry. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.