No matter what you are bidding, no matter what service you are providing, always always take the "50,000 ft look" at it. In other words, once you've completed the bid package, look at the bottom line and say "is that reasonable for the client and is that reasonable for me". Look at your competition. If you lose the bid, ask your prospect if they would mind (for your education) telling you why you didn't get the bid. Be prepared for all kinds of responses. You'll get better at it - keep plugging along.