You don't have to bleed the brakes when you replace the pads. Only when you open the hydraulic system. You'll twist the pistons & retract them (to make room for the thicker new pads). When you do this you push fluid back to the reservoir, watch so it doesn't overflow.

But how old is your brake fluid? It's a good idea to bleed the brakes, just to replace the fluid with fresh stuff every couple years.