how can i change the kitchen faucet and sprayer?
'Wired has it right, but forgot: Measure the 'hole pattern' in your existing sink/countertop and be sure that the replacement you buy has the same pattern. There are different numbers and spacings of those holes. It's maybe a two hour job for an experienced plumber. You should be able to do it in less than a day.
you can get a kitchen faucet with sprayer in various applications, rundown is : shut off water supply valves under sink, disconnect water supply lines from the shutoff valves to the faucet. there will be nuts holding the faucet and sprayer (if its off to the side) remove these with a basin wrench. (purchased at lowes, home depot) simply pull faucet upwards and out. reattach new faucet with plumbers putty on the base of the faucet and reset in sink. attach new nuts that hold faucet body down and tighten till putty compresses fully flat. remove excess, reattach new water supply lines to avoid leaky old used ones. reopen your shut off valves and check for leaks, tighten any loose fittings in case of a water leak - all in all, your new faucet will have a manual to assist as well -best luck
It's not very difficult to install a new faucet, but if you don't have the slightest clue, you are better off getting someone who knows what they are doing. An improperly tightened compression nut WILL pop off eventually and cause a BIG flood (probably when you aren't home). It can also be a bit tricky getting up their in a tight space and loosening the lines to the faucet.
Select one at a hardware store and install it. If you are asking how to remove and install one that's different. You will need a basin wrench to reach up high to the old and new fixture to remove and install new lines. New fixtures come with complete instructions. Basically all you do is turn off the water lines, remove the lines, remove all the nuts holding the old fixture in place, then reverse the procedure to install the new one. Not usually very difficult to do.