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.
Definitely I agree to this entirely cause they say if you're not informed you're deformed, so having being put into pressure of trading alot of things are involved but on a serious note it's to get the right information and be properly guided instead of going in and coming out with losses and regrets. One thing i take note of while trading is never to go with the crowd because alot of people regretting trading today is at a results of being under pressure.