Well, first things first, I figured out how to level up incredibly quickly in the very beginning with a 100% legal method.
Crafting wood posts.
First you'll have to make sure you get idiot savant or high intelligence, and next you'll cut down every single tree in sanctuary.
This will give you around 3000 wood, and the next step is simple.
Craft wood posts, in the fence column. They require 2 wood.
[b][u]2[/u][/b]
Then you craft 1500 wood posts and you're level 10.
Then you step into the wasteland for your first real combat and are killed by a single raider and his dog just northeast of sanctuary because you ENTIRELY underestimated the effects of survival mode.
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Turned on Survival. Found a Legendary Radroach. Killed with 2 hits. Worst part is that I quicksaved. Same thing happened on Fallout New Vegas. Put Hardcore on (I think that's what it's called) and I found a Cazador. That big flying mutated stinging fly? I got hit once and quicksaved. Died from the poison. Quickload, died again. Died more than 50 times before I just made a new character...