Pain is subjective. That means, how it feels to you is going to depend a lot on your opinion and your individual experience with the situation. If you are tired, or if your blood sugar is low beforehand, it can hurt more. Also, the skill and speed with which your piercer does the actual piercing can greatly effect how it feels.
Piercing so many parts at once might give you an endorphin rush and make it seem like it doesn't hurt as much, or it might be exhausting to you which might make it harder to take the subsequent piercings.
You'll have to stop back and let us know how it was for you. Which are you getting pierced first? Any particular reason? What gauge are you getting everything pierced at?