Forum:Legion and NCR reputation

I have neutral with legion and lot of fame with NCR. Is it possible to get both to friedly. Also should all legion become hostile if you are hated, or vilified? Because at one point I killed like lot of legion, and they still were not hostile.

if you kill anyone when you're hidden, they won't attack you or you don't lose fame. Don't do any quest rewards have infamy, Try to gain ncr fame with side quest and kill ncr soldier when you're hidden, collect their dog tag and give it to Severus in Cottonwood Cove. Don't forget if legion likes you, Boone'll hates you