Thanks for the advice. Somehow, I never found (Although I never tried) it interesting. May be I will give it a try. Could you tell me which are some of the best places?. Recently I got to know about toptal. Is that good?
What I do is scrape several sites into a single HTML document. The HTML is just a vertical list of links, each pointing to a single job ad. When a link is clicked the respective ad is opened in a new tab. I can usually find 5 quality ads to respond to in one day and I usually hear back from at least one of them.
Of course, how you structure your freelancing is important. It's easy to fall into freelancing that feels very similar to full-time in-office positions.