I've been wanting to go to Divisoria because I've heard you can get so much for so little there, but I'm afraid it would be too much pandemonium for me. Any tips or suggestions to prepare me?

Its best to go there on a weekday early morning. Beforehand try to prepare a list of items you needed to buy so you can know where to go to find those products. For example for fabrics you can check Tabora, for party needs in bulk whoesale prices (candies and favors) you can check The vicinity of Divisoria Mall. For good finds of RTW clothes you can check 168,888, Tutuban and 11/88 mall (fully airconditioned). For fruits and vegetables you can check Ilaya. In this scorching summer heat you might want to consider just dressing in cotton shirt and short. Keep a umbrella handy, wearing a sunglass wouldnt hurt and bring a cold bottled water with you. Also bring your own shopping bag and keep your belongings safe abd secured. And just enjoy the experience, truly Divisoria is the place to be for super good deals.