Torn caliper piston dust boot

2016 Corolla S. 143K miles.

Had a guy replace my rear pads and rotors and he tore the piston dust boot off trying to compress the piston.

I’m saw they sell the boot online. Do I have to remove the caliper piston and bleed brakes to replace or does it just pop in? Hoping I can replace it myself. Inner seal is good and I only have to ride without dust boot for a few days