I got the typical wiring diagram from a Haynes Manual. Your local library might have a copy. I assume that you look for hold down screws, remove them if they exist, then simply pull out on the flasher and it slides out. That’s how it works on some other cars. The principle problem is that you are going to have to stand on your head in order to work yourself into the space high up under the dash over to the left of the steering column. And I think that the brake pedal is in that area in order to further impede access and visibility.
You might be able to get into the area by sliding the driver’s seat all the way back, opening the driver’s door, laying on the ground with your feet toward the rear of the car, and trying to slither over the door sill until you can get your head and hands into the area and actually see and remove the flasher.
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Our Camry has proved to be very reliable. Which is a good thing because it is not much fun to work on.