You don´t need to have another person, what you do is log your drive and drive as steadily as possible while doing so, slow pedal changes and lengty periods at all rpms and loads, you don´t need every load or rpm but enough so that a picture of known spots can be made, rest is usually interpolation between those points.
If I am by myself I log and review while parked on the side of the road somewhere safe, then update the map and repeat, doesn´t take long to get a fuel map that is 95% there.
VE maps are smooth, especially since the the VE values are representative against manifold pressure as well so the values don´t change much.
I have used the autotune but that was on a dyno and was an experiment if anything, it takes no time at all to do the same work as autotune would do.
