Francisco,
Be very careful when bidding one European ebay, if you mistake and use the period instead of the comma, you bid will be two didgits higher than you want, also, if you use the drop down on the bid window to select a bid that you have used in the past (I often use an odd cents bid when bidding, and I would type in the first number then click on the bid I wanted) be vary careful not to use a bid with a comma on the US ebay, or again, you will bid very high (I once bid $1040. on a book I only planned on bidding $10.40, if you bid late in the auction, you can not retract a bid). Other than that, bidding on the foreign ebays is easy, the only thing that can get difficult is making payment.
Bes twishes
Gus