Obviously, bid on an item that you NEED, and WANT, and are WILLING TO PAY FULL PRICE FOR.
Begin bidding tentatively at the price most people are quitting. Even the autobidders are not going to set unreasonable limits. Lastly, spend only ten percent of your planned bid price when you begin. You must play close attention when you are getting bids every ten seconds or you will be timed out. Make sure your computer isn't acting up when bidding is vital.