Most of the people on the forums will be like me after 20+ playthroughs... I'll spend most of my game liked by most factions, with everything going smoothly, because after hours of New Vegas you learn what your doing pretty well. But the first time, when you don't understand the implications of you actions (or the repair menu) things will go wrong. So where did you balls up in your first attempt?

Personally, I destroyed all of the securitrons under the fort and then did the independent ending... BAD MOVE.

attacked the kahns at boulder city. didn't know they had a good arms merchant.

Walked into Nipton wearing a set of NCR armor.

The Legion didn't appreciate it.