I don't think it is only about pressure. I can think up a solution to a problem in my head, but to really work it out I have to be behind my computer and start typing. I almost never get something right in 1 try.

I think my style is more trial and error, I make something and see if it works, if not I continue. So of course, a lot of great programmers actually are able to do that, but I think there are also a lot of people who work like I do.