Not to put too find a point on it, but I can identify with being broke. However, I still can’t fathom using CL for parts or labor. There comes a point where trying to save money costs more money, and I believe you’ve crossed it.
Replacing brake pads on disc brakes is one of the easiest jobs you can do on a car, so if you can’t afford to take it to a mechanic, watch some YouTube videos to see how the job is performed on your car and do one side at a time so you can refer to the intact side if you need to. It would also help to find someone who has done brake work before to help you.
Replacing the rotors is another issue. Sometimes it’s easy and sometimes you can’t take them off without repacking the bearings. If the YouTube videos make it look easy, and the rotors pop right off and slide back on, you can install them yourself. If they require repacking of the bearings, you’re better off hiring someone to do all of the work, including the pads, but please find a reputable shop to do the work. Also, if you buy new rotors, you might also have to pay to have them machined before you install them, depending on how they come.
The great thing about buying new parts at an auto parts store is that you can take the old parts with you so you can compare them to the new ones and make sure they’re nearly identical. When you order them online, you roll the dice, and often have to pay for return shipping if you want any of your money back.