I love the couch to 5k. I started it about a year and a half ago, I couldn't run at all, never even tried. Almost finished and I quit, but it definitely got me started on running. When I got back to the treadmill I made up my own routine, but without the c25k there would've been no way I could've even gotten started. It's the root of my success. It definitely works to, and you can tell how much easier it gets. I sugges if you don't feel very confident on moving on to the next week, redo the week your already on until you feel confident, that's what I did!
Now I get in about 3 miles, mostly running, every other day thanks to the c25k! Good luck!