If there's one sure way to improve your writing skills it's to practice. It might not make you perfect (who is?) but it will make you pretty good. Even if you can only carve out an hour a day in which to write something - anything - you will eventually improve your craft. And if you make more time to write? You'll get better faster.
A while back I was doing just that, carving out an hour here and there between all the other things I had to do. But I wasn't getting where I wanted to go very fast so I decided to change my strategy. I quit watching a lot of tv (and yes! I miss it but it had to be done) and I quit trying to keep my house super clean and perfect. Now I write for a few hours almost every night plus 4-6 hours on the weekends (a little less in the summer and a little more in the winter). And guess what? Not only am I getting better but I'm also getting closer to my goal. Practice has made a difference.
If you want some extra practice time as well as an opportunity to discuss what you're working on, consider heading over to the Practice Room (see the picture on the sidebar). There are times to fit everyone's schedule and writers just like you who are trying to improve their craft. I usually go on Monday nights. Maybe I'll see you there :)
As for Rule #2, I'd have to say reading. What do you think? Or, care to add Rule #3?