Eddie51 knows whereof he speaks... however, to make the process simpler as well as assure that one doesn't have to set there for the last few minutes of a selling item, you can use aservice (free) souch as "Goofbay" (and others. You simply copy the items Ebay listing number out of Ebay, and paste it into the Goofbay site and select the maximum amount you wish to bid, set the time you want it to appear (down to the last second, if you wish) and then you'll benotified by both Ebay and Goofbay if you've won the item. No one else can see that bid.
I use it all th etime. It only takes a minute to register with the site and, as said, costs nothing...