I just replaced my leaky kitchen faucet by myself (you have to know I am not a plumber!) and if I can do it, so can anyone. I had to buy a faucet core puller device, works kind of like a wine corkscrew. Home Depot has them. Then, once I pulled the core out, I took it to the hardware place and found the same one. I am pretty sure they come with all the o-rings too. No more leaks!