We would probably be better off seeding just some basic life first well before humans - give it time to adapt to the local environment and setup shop. Of course

We would probably be better off seeding just some basic life first well before humans - give it time to adapt to the local environment and setup shop. Of course this could also backfire (in that it might evolve to be very hostile to human life) but if there is one thing humans are amazing at it is outcompeting other potentially hostile forms of life.