leaking faucet

Both of the faucets in my bath rooms will not turn off all the way. I have had the seals replaced and even the stems. But after about a year they begin to leak again. I know that you are not supposed to tighten the handle too much, but that is the only way I can slow the flow of water. Is there anyway to adjust the handles so the water will shut off completely? Do I need to turn the water off at the main to do this, or if I remove the screw in the handle will I get a gusher? I am thinking of replacing the entire unit, but I need to get water turned off until I can afford a decent plumber. Can you offer any step by step instructions that I can follow..My hubby is a carpenter..and you never give a carpenter a wrench..haha..thanks for your help.

 

there should be an individual valve for
the hot and cold source under the vanity,
if so turn them both off then turn the faucet
on to be sure there off,then you can remove
the faucet,just disconnect the 2 supply
tubes,and the 2 nuts up at the faucet that
hold it to the sink,and if you are lucky,
and it is not rusted in place it will
cooperate.also it is probobly the valve
seats that's making the faucet drip.

 

Thanks for your quick reply..however I guess I should have told you that the leaking faucet was in the tubs and not the sinks..oops. so I can assume there will be not shut off handle close by and I will need to turn water off at the main. Does the remainder of your instructions still apply?