You need to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
I just changed the alternator on a '96 Sentra - day one involved removal of old alternator - passenger side fan and overflow tank had to be removed. I left the rad hose as-is. The used $75 CDN alternator from recycler was not exactly the same. After a few frustrating hours trying to get the "new" one in, I realized that the casting boss near the idler was about half an inch wider, therefore the original 14 mm/M10 bolt was about half an inch too short. I went to a fastener store, bought a 40 mm long M10 bolt and thought I was in business, until realizing that the same thicker boss was also contacting the threads of the tensioner rod. A few minutes of filing off some material off the bottom of the boss provided the clearance required to no longer contact the tensioner bolt. As well, the tensioner was stuck in place, making belt replacement impossible. The alternator had to be removed again, the tensioner pulley 14 mm bolt loosened so that the pulley could be slid in its slot. We put the belt back on, and tightened the 14 mm tensioner pulley bolt, then the 8 mm tensioner rod and then the 14 mm tensioner set screw bolt. Frustrating, yes, but mostly because the replacement alternator wasn't exactly the same, so double check before installing. It will likely still work, but may need some minor modification.