Replacing a kitchen sink without replacing the countertop is feasible with the right materials, tools, and preparation. Essential materials include a new sink, plumber’s putty, caulk, mounting hardware, and protective gear. Tools needed are a jigsaw, template, drill, screwdriver, and wrench. Create the cutout using a template, prepare the surface, mount the sink, make plumbing connections, caulk around the edges, and enjoy your new sink. Professional assistance is an option if necessary.