edit: to clarify, when submitting orders to an electronic exchange, traders will call out (to themselves) the price size direction and instrument before sending the ticket. I personally also mouseover all the important parts so i'm not just going through motions.

this method seems particularly effective for work that is routine but never in the same scenario. Ever since I picked up this habit I have applied this to everything else I do - booking flight tickets, hotels, buying things on amazon, etc. avoiding errors is so much of a good thing - for those of you with really bad experiences firefighting at work will know the importance of not being in the position where you need to firefight at all.