You won't even think about trading under pressure if you are learning to trade the right way. You cannot trade under pressure if you read trading books, have mentors, be a part of peer group of traders. The people who are likely to trade under pressure are those who are greedy and want to make it a get rich schemes. Trading for them is short term and not a long term endeavor.
Exactly trading is not something one have to go into especially when under pressure to do so, I know some people are into trading cause they hear it's a quick money making scheme or something of such or better still they are being told from a friend's of how much they've been making or catching out from their trades, so then they put themselves under pressure and take up the risks of joining inorder to get their quick money not knowing it's not as it may seems and they may tend to lose on several occasions if they carry up this mindset. So I'll rather advice that one go into trading when they've must have understood what's all about and necessarily study the markets trends.