Honduras, one of the least fancied World Cup sides, lost 1-0 to Chile in their opening game in Nelspruit on Wednesday.
They only just made it to the finals in South Africa but expectations are high in the poor country, which last qualified for the tournament in 1982, and assistant coach Alexis Mendoza said that had proved a weighty burden.
"When you start playing the first match in the World Cup it's difficult. Honduras was absent for 28 years and that's a heavy responsibility to deal with," he told reporters after Wednesday's game.
"We weren't able to unleash all our forces on the pitch."
"Spain are favourites and we respect them. We will play and try to overcome our stage fright," he said in comments before Switzerland's victory.
Honduras's uphill struggle looked even tougher this week after midfielder Julio Cesar de Leon, nicknamed Rambo, was ruled out with a thigh injury.
"Throughout our preparation we'd worked specifically with players who ended up being ruled out," said defender Maynor Figueroa.
"Things are definitely going to be different against Spain because the team will have more confidence regardless of who the rival is," Guevara told Reuters.
"It's all down to state of mind. We have to be really sure of ourselves and score because in this next game we need total concentration. We can't make any mistakes."
