Alternator repair for 1990 Nissan Sentra

I have a 1990 Nissan Sentra with approximatley 236,000 miles. It is a manual five speed, 2x4, and a 4 cylider engine. Sorry I don't know much about cars.

I need to replace my alternator and I was hoping you could provide me with basic instructions on how to locate the alternator in my 90 Sentra, how to take it out, and how to put in the new alternator. Also, if you would please provide me with any potential trouble-shooting and solutions, that would be greatly appreciated.

Thank you for your service, and have a great day!