I'd say first things first look into the academic credentials you're going to need to go into finance in any capacity (there are lots of roles other than IB, including consulting and financial modelling) and see if it's something that clicks for you. If you aren't going to be able to excel academically you likely aren't going to get your foot in the door (absent nepotism).
I've worked deals with big time IB people and they seem to run the gamut from the stereotypical person others have listed to really cool down to earth people. It will be demanding, it will be incredibly stressful and you will have days that you absolutely breakdown. I went through it on the legal side before finding a niche that allowed me to avoid a lot of that stress and it's not fun at all. At the end of the day you have to ask yourself if it's worth it, be it for the money or the experience, to make that sacrifice.
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