Do a large part of the main quest and various other minor quests until you're a high enough level to have the anti-material rifle, a sniper rifle or a fully modified (scope, custom bolt action and extended mags) hunting rifle and boon(e?). You also need to invest most of your points into small guns (or just guns for F:NV) and some into sneak so that you can creep around and sneak attack them.
Another tip is for you to go to the top middle left of the map, there should be a farm around there. Head north from that farm towards the top of the map again. If you have the wild wasteland perk on then you'll meet a band of aliens with the alien blaster that is perfect for fighting deathclaws. If you don't have the wild wasteland perk then you'll meet a band of mercs with a YCS/86 Gauss Rifle which is perfect if most of your points are already in energy weapons.
These are the two conventional means of killing deathclaws. Another, far more rewarding area filled with deathclaws is the land to at the bottom East of the map, right of Caesar's Fort. There is a small opening somewhere along the island that you can use to get onto the island. You will need to have an anti-material rifle and either the blaster or the gauss rifle, you can't sneak attack these deathclaws. Only when you're ready.
Good luck, you will actually need good luck in Fallout.
Another tip is for you to go to the top middle left of the map, there should be a farm around there. Head north from that farm towards the top of the map again. If you have the wild wasteland perk on then you'll meet a band of aliens with the alien blaster that is perfect for fighting deathclaws. If you don't have the wild wasteland perk then you'll meet a band of mercs with a YCS/86 Gauss Rifle which is perfect if most of your points are already in energy weapons.
These are the two conventional means of killing deathclaws. Another, far more rewarding area filled with deathclaws is the land to at the bottom East of the map, right of Caesar's Fort. There is a small opening somewhere along the island that you can use to get onto the island. You will need to have an anti-material rifle and either the blaster or the gauss rifle, you can't sneak attack these deathclaws. Only when you're ready.
Good luck, you will actually need good luck in Fallout.