What piece of advice has always stuck with you?

Originally Posted by Hypoman

Lesson: When a client asks you if you want anything up front, take it. At least get your expenses paid. Then collect your profits after your done.

This is how I recommend ordering anything. If I need to special order a computer that I will buy for $125, and sell for $225, I get the 125 to order it. You get two advantages- the buyer is committed to buying, and your bank account balance won't decrease.