Motorist has a flat tire and is in the process of changing it. one of the lug nuts is very tight and he is trying to remove it. if he is able to push or pull it. which is the best approach

Actually motorist best approach here is to trying to figure out the correct removing rotation of lug nuts, then rotate in that direction it smoothly as possible by applying some oil or grease, which will surely do the need of the motorist to change the flat tire safely, instead of pushing or pulling it hard, which not solve the problem at all even after lot of time and energy,