Chess is a very tough game, and psychologically a tough game. And of course chess needs a lot of qualities, human qualities. And so you must have very strong nervous system and then you must be well prepared, you must be able to work a lot.
By all means examine the games of the great chess players, but don't swallow them whole. Their games are valuable not for their separate moves, but for their vision of chess, their way of thinking.
If the opponent offers keen play I don't object; but in such cases I get less satisfaction, even if I win, than from a game conducted according to all the rules of strategy with its ruthless logic.
I still remember Botvinnik's reaction to each of my games, right from the opening moves. At first he would express amazement, then annoyance, and, finally irritation.