First if you are going to attempt repairs on your own it would be a good Idea to get a [http://www.themotorbookstore.com/Nissan.html manual] on your car. There should be a Tensioner that keeps the belt tight. On my Dodge Van the Tensioner arm has a 1/2-inch drive square hole. That allows the tension to be removed and the belt removed. This may be your case as well, you will just have to figure out which way to push or pull. The Manual is only $16 dollars and will save you some headache's. Good Luck and Remember.
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No it has electric power steering.
NOPE!!!
You don't. Electronic feed pump. If steering gets bad, go to dealer and have pump checked.
Use a flared end wrench
on the backside of the engine
how to remove a power steering pulley on a 1997 Nissan altima
If the Nissan Sentra is leaking power steering fluid, the power steering pump will need to be replaced. This part can be purchased at a salvage yard in most cases. A new power steering pump will cost between $90 and $130 just for the part. A salvage yard will probably charge $50 to $80 for a used one.
Use Dexron II transmission fluid.
Should be a pump with a reservoir and a couple lines coming off of it to your steering rack with a cap on top. Remove it and if there is a dipstick on back of it you found it.
Power steering is under the hood on the passenger side in the corner closest to the windshield It is a black cylinder with turn off top. Remove the top and read the indicator stick. Use power steering fluid to add until reads full on the indicator stick.
It would depend on your level of competence.
It is a black reservoir to the left of the engine. A small dipstick is attached to the back of the cap to measure the power steering fluid level.