You can use a toaster, but your yield will be poor. Slapping some insulation on the oven and a PID controller will improve things significantly. If you screw u

You can use a toaster, but your yield will be poor. Slapping some insulation on the oven and a PID controller will improve things significantly. If you screw up the solder job, you can use a hot air gun to remove the BGA part, reball it (using a stencil, fairly cheap if its a common package), then try reflowing again. If you practice for a few hours on scrap electronics, you can get good enough at it.