Before my husband takes the old faucet out and tries to put a new one in, I just wanted to ask, is this impossible for a normal human to do? We have no yet gone to the store and purchased a new faucet. My husband does know a bit, he put in our garbage disposal. I know he could do this, I just have heard horror stories of people “trying” to put in a new kitchen faucet. How do I know which faucet will fit my sink?