It stopped working out of no where so the only way i can use my kitchen sink is to use the hand held spreyer.. I have never replaced one before and wasnt sure if i need to turn off water to the whole house or not...
if it has an aerator on the spout remove it and clean it,
you can just turn the valves off but i suggest since you are doing this, go ahead and replace the valves and drain lines too. if you replace the valves, yes, turn the water off at the street. when i replace faucets, and if the money is there, i always suggest replacing everything. (i hate old leaky valves) use those 1/4 turn on/off valves too!
No, just the valves under the sink. It may be the sprayer is actually the failure point, they seem to get gunked up, and won't release, they sell a $5 kit to just replace the head on the sprayer, but they rarely work, save yourself the trouble and buy the $15 hose and sprayer kit to replace the whole thing altogether.
before doing any thing try cleaning the filter at the spout. at the end of your fauset spout there is a screen. sometimes theres as many as 3 screens stacked one on top of the other. twist off the end counter clockwise and see if they are plugged. if so just clean them and put them back and walla new faucet. if it does need replaced though, all you needto do is turn the 2 water valves off under your sink. not the main water supply. some faucets can be a bear if you haven't done it before. you might need a basin wrench for the nuts if there isn't enough room for a cresent wrench. good luck.
