Hi Nadia! Just thought I'd put my 2 cents in....
yes you can use circulars if the project is small enough but Ihope you'll learn the delights of double points some time because they are just as easy if not easier. I'm knitting a headband for the first time and using a small circular but it's kind of a drag because you have to keep stopping to push the stitches around... it's more labor intensive than dpns actually. Dpns are clumsy at first but then, well for me, I find them so much fun and they are easier for me too.
Half the time I just transfer my work over to dpns coz I'm tired of the circular. I'm talking smalllll projects though, I'm doing my Einstein coat on my wonderful Addi Turbo circular. good luck!