I feel for ya!!! I had started a baby blanket for my neice and was about 40 rows in... and whooops.. dropped a stitch.. yikes! Anyways... I ended up having to frog the whole thing. I wished I hadn't now as I could fix it since I have more experience.
I've only been knitting since august, but the learning curve is steep. Trust me! You'll get the hang of it all in no time. I did a few dishclothes and then went straight to hats. they are sooo easy to manage and take far less time than a scarf! I am working on a scarf for myself at the moment and I set it down about halfway through every evening to work on another project because I find it so BOORRRRING.
Trying knitting a few small things.. maybe a kitty toy or dish cloth so that you can finish it and have that great feeling of something complete! It is the best motivator you could hope for. I am all for the instant gratification!
If you have a kitty... take a small amount of your scarf yarn, knit a square that is maybe 3x3 inches, fold it corner to corner, sew it up almost the entire way, stuff it full of stuffing.. cotton balls, dryer fluff.. whatever takes up room and doesn't fall through the holes in the knitting and add some cat nip. Then go play with kitty for a bit to relax and only after that... go back to your scarf.