Here i outline how to modify a human to be able to live on mars without a pressure suit, breathing mask or cold protective clothing and VERY little terraforming.

The Only Terraforming required will be the good old nuke the poles, and a 57 tonne electromagnet orbiting at L1 orbital.
https://medium.com/our-space/an-artificial-martian-magnetosphere-fd3803ea600c.

I was the anon previously behind the earth to titan posts, showing titan was a better option for colonisation, i have now come to the conclusion that we now must colonise mars first to prevent the undesirables (non-Europeans) on earth no avenue out, regardless of the challenges on mars or advantages titan has.