General Diablo 3 Power Leveling

Normal - Normal is actually pretty much a cakewalk. You shouldn't have any problems in normal, AT ALL. I actually used Leap and charge most of the time while in normal just so I could get around faster. The hard part starts in nightmare, and even then with the right build and decent items, you should be fine. Stick with my generic leveling build and you'll be A-OKAY.

Nightmare - Nightmare can be pretty tough if you aren't decently geared. Still, as long as you have enough health to actually take the initial brunt of the damage, revenge should heal you right up. Not too much to worry about here.

Hell - Hell gets pretty tough. Personally, after having been playing on Inferno with diablo 3 power leveling and going back to Hell on occasion, I find it to be RIDICULOUSLY easier. It's a lot harder because the learning curve is pretty steep. You have to actually pay attention to the elite mob's abilities and react appropriately

It also helps to clear out any small mobs that might interfere with killing the elite mobs. Makes your life a whole lot easier. Even so, with my build, you should be pretty damn safe.

Inferno - I'm almost to the end of act I on Inferno and I can safely say this is one of the most challenging games I've ever played. The fun I have while playing it is crazy. Some elite mobs have the craziest combination of abilities that you have to flat out skip them because they're unkillable.

My build works to an extent, but Inferno in itself is just VERY hard. Currently I duo it with a friend and on most elite packs we have to split them up. They generally consist of three. I'll take one and burst it down with crazy damage while my monk friend tanks the other two.

I use the same build that I do with normal through hell. It's your safest choice. You just have to play very carefully with diablo 3 power leveling if you want to make it through this terrifying place.

Remember, this is just my opinion and I wouldn't doubt that there are better builds out there. The best advice I can give you is there is no one specific build. Try and adjust your skills / items to fit your playstyle / situation.

Weapon Set: If you are wondering which weapons I am using, like I stated above, it's whatever weapon works for you. I've used both a 1H + shield and a 2H in both hell and inferno. I generally replace my gear with whatever is better.