What can I do to cut the costs to myself?

Preparation is the key! Do you know what feel you are looking for?
Have you got files with the text/artwork you want on the web site?
Have you got a good idea of what the graphics ought to look like?

The less we have to retrace our steps because of a changed idea on your part, the less the price will rise. Likewise, the less time we have to spend on mindless typing and retyping of what should be prepared material on your part, the lower your bill will be, so minimize the cost by minimizing the drudgery.