For those of you doing heavy deadlifts and other big lifts here is a handy tool. I found in order to get your max potential when you hit the gym you must plan out your lifts for that training session. Using a 1 rep calculator is a excellent way to determine what amount of weight you want to lift for your training session.
Here is a link for a calculator, there are many out there.
http://www.bodybuilding.com/fun/1rm.htm
The mind is a powerful tool so by predicting what you will lift the day before it can have a huge impact in the effectiveness of your training goals for that day. You are brain washing yourself but for some people it works. When it comes to moving heavy weight allot depends on how well you have trained your central nervous system. Ever wonder why in sports like powerlifting there is not a huge difference in weights lifted vs weight categories .