Some more pressure is that it takes a bit of strength in character to resist the pressure, but the Quran condemns pride and emphasizes on humbling oneself to God's revelations/signs/verses. It emphasizes on being broken by God's words. All this adds to the emotional pressure.
It's like Mohammad understood the psychology of people very well and knew how to manipulate it in his favour. Along with that is the showing of the "chosen" status of Prophets, making it seem like Mohammad is of this high character, and that surely he must be telling the truth, being this special. Which of course is circular reasoning, but when it comes to appealing to emotion, circular reasoning works often.
It's like Mohammad understood the psychology of people very well and knew how to manipulate it in his favour. Along with that is the showing of the "chosen" status of Prophets, making it seem like Mohammad is of this high character, and that surely he must be telling the truth, being this special. Which of course is circular reasoning, but when it comes to appealing to emotion, circular reasoning works often.