Take it in and get a garage with an impact gun to remove them before you strip them and possibly cost yourself a rim.
Try jacking up the car and putting it on a jackstand. Put the lug wrench on the lugnut, use the lugwrench to spin the wheel in the opposite direction of loosening then jerk the lugwrench the loosening direction using the momentum from the wheel to help you loosen it.
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If your vehicle has an automatic belt tensioner with a serpentine belt, the belt is worn and needs to be replaced. On older models, the belt tension can be set by adjusting it at the alternator bracket. Loosen but do not remove the two bolts that hold the alternator in place (one at the bracket and one on the block) and pull the alternator to tighten the belt. Hold in position while re-tightening the bracket bolt then tighten the bolt on the block.
I have a 1993 Nissan Altima, in which I had to loosen the Alternater Adjustment screws to get the old belt off. After replacing the belt, simply retighten the bolts until the belt is snug. Hope this helps.
The starter is bolted onto the transmission on the driver side. There are two bolts that holds the starter in place. The first bolt is located under the starter which is easy to get. The second bolt is located on the top of the starter which has a tight sqeeze to get to. Most mechanic will drop the transmission or loosen the transmission to get to it. With due respect, if you have small hands, you may be able to reach it.
It is on the right side just in front of the bell housing. It is held on with two bolts. Remove the cables to it at the right front fender well, and take out the two bolts.
The alternator on a 2001 Nissan Sentra is replaced by loosening the serpentine belt tension, loosening the alternator bolts, and slipping the belt off the pulley. The alternator can then be unbolted, the wiring harness disconnected, and a new alternator put in place.