Overall, the best method is always to choose the absolute maximum you are willing to pay, and place an automatic bid as early as possible. If you get outbid, then it was more than you were willing to pay anyway.  Visiting from DISCO3.CO.UK
Discovery 3 TDV6 Auto HSE Zambezi Silver

Correct

Highest amount that you are willing to pay, and it will bid that right at the end, so there is no time for anyone else to react, and provided that you have bid high enough, it will win you the auction at the lowest possible amount that is with in your maximum bid

i.e. if the item is at £12 and no else bids and you have set your bid to £21.56, at the last second it will bid for you and you will win at £13 and look Rather than bidding your £21.56 in the normal way and some keeps on adding a £1 until you've been out bid And if during your wait you suddenly have a moment of clarity and want to back out, simples, delete your bid on Bidnapper and no one will know that you were there, this works up to 15 minutes before, then your committed  Yesterday I couldn't spell Engineer... Today I are one!
Inventor of the 'Guide-o-Matic automatic wheel alignment tool'
Former long term L322 owner, Up/Down graded to a Classic Tractor!