How do i change a windshield washer pump in my 1990 pontiac bonneville?

I believe they just press in and out, disconnect it, carefully pry the old one out with a screwdriver, remember that old plastic gets brittle so try to be gentle, and press the new one in|||i had a 78 once and they are built into the wiper motor.auto zone has the kit for them.what usually goes on them is the diafram in the pump.so easy to change,just take out 4 screws and out it comes.