Yesterday, promoted by a free voucher from Google, I started an AdWords web based advertising campaign for my "Green Technology Strategies" book. This did not start well, as the spell checker in my Firefox browser does not work with the forms the Google AdWords system uses. As a result I misspelled "Telchinology" in the title of the advertisement. No one is likely to buy a book from someone who misspells the title. There is no way to edit the content of an existing ad, you have to delete it and start again.
With that done, I set the campaign for $7.50 a day for a week and left it to Google's system to work out how many ads to put where (except none on my own web site). I set AdWords a tough challenge by trying to sell the most expensive, slowest to deliver hardback edition of the book. I was going to attribute a sale of e-book to the campaign, but so far the ad hasn't been through Google's review process and so can't run on web sites (and hasn't appeared on the Google search).
Google do try hard to make AdWords easy to use, but there is still a lot to learn (and for traditional marketers, a lot to unlearn).