Ultimately you are never going to Mars, its just a good cash cow for our favorite US government funded wellfare queen.
The whole Mars obsession is so stupid. Yes, we can get to Mars. We already have, with orbiters and landers/rovers. Getting humans there is just a matter of scaling things up, even if it would be a massive undertaking and cost a fuckton that would be better spent elsewhere.
But once there, then what? "Hurr durr, nuke the poles" says Musk - that wouldn't help, but even if it would create a temporary atmosphere, it wouldn't last one bit. Mars has no magnetic field anymore, it would get blown away by the solar wind (which is exactly what has happened before, hence practically no atmosphere nowadays). It would be like creating a Moon base, but far more costly and impractical. And in the case of an emergency, recovery missions to Mars will take months instead of days when compared to the Moon.
...which is why Elon should lead the way to Mars and be on the first mission, if one were ever to happen. For the rest of us, I suggest we try to maintain this planet as habitable as we can, because we ain't going anywhere else soon.