How do you replace the driver side door latch on a 2000 nissan sentra,cant see how it is installed and get hands in there. is there a certain way of doing this?

The fuses and relays cover all the windows, so the likely culprit is the door switch module.

https://www.google.com/search?q=2002+nissan+sentra+window+switch

Nissan Sentra (B15; 2000-2006) fuses and relays

https://fuse-box.info > nissan > nissan-sentra-b15-2000-...

Here you will find fuse box diagrams of Nissan Sentra 2000, 2001, 2002, 2003, 2004, 2005 and 2006, get information about the location of the fuse panels ...

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Take the door panel off and remove the linkage and retainer for the lock cylinder. If you just need it rekeyed take that part to locksmith, so it will match the other cylinders and work with your key

take off inside door panel then interior handle then latch at end of door in the jamb it will come right out remove all screws that hold these items in no matter how many there are

bad electric window motor inside the door, replace motor.

Here's a trick I learned from a local body shop where I live.
Get a sawzall and cut the post that the latch hooks to.

This will open the door for you. Then repair whatever is required in the door, and replace the post on the inside of the body is cheaper than damaging anything else in the door.

Good luck on this repair.

most likly need a door lock actuator for drivers door

probably weak window motors or the inside tracking in door has to be greased by taking off door panels

Go to dealership they will give a diagram to locate every single one. I replace them on my daughter car. I believe there were three sensors. I exactly know what you are talking about. I had a hard time locating the back one right above the drive shaft on driver side.

Open the trunk and locate the trim door that covers the back of the drivers side tail light assembly. Open the door and locate the bulb holder. The bulb holder can be removed from the tail light assembly housing by turning counter clockwise 1/4 turn. Holding the bulb holder in one hand, press gently on the bulb and turn then bulb counter clockwise to remove. Replace with a combo bulb and reverse proceedure to re-install.

had to install a driver side non folding mirror, fairly simply to say the least. There's a cover on the interior of the door, near the window, remove the cover, remove the 3 screws, need i believe a 10mm socket. If a power window, unhook the circuit. Replace new mirror.