Hmmm...where to start? I know your eyes are telling your brain that there's no way in heck that vehicle fits in that little bitty lane!
You did better than me with our first 38ft, I only made it 3 miles when I stopped it in the road and told DH this thing don't fit! Wasn't until he passed that I learned to drive it. You just need time behind the wheel on some quiet country roads to get used to it, and I know with your schedule that's gonna be hard. So #1..look where you want to go, not where you don't want to go. Your hands will follow your eyes, so if you look at the opposite lane or off to the right, that's where you'll go. #2...look out about 4-6 car lengths ahead. Try not to look down at the road. This will help you keep centered in your lane. If you're going around a curve, look thru the curve to the other side of it. This also helps keep you centered while navigating the curve. When making a left turn, pull out past the center of the intersection before you start to turn, and watch your left mirror as you get halfway thru to make sure you're gonna miss the car on your left. Right hand turns are a little trickier, you have to pull forward enough to miss the curb w/o hitting the car in the lane next to you or the one you're turning into. Just takes practice and sometimes you just have to be patient and wait for a car to move before you can do it. Practice in a parking lot when you can and have Ron either stand or put a bucket where your tail swing takes you so you know how much room you have. Practice backing up in a straight line using the lines in a parking lot. If you're not used to using side mirrors to back up, this is gonna be a tough one for you, but one you absolutely have to master.
Sorry this was so long, was just trying to think of things to help you out. Mostly relax, and drive your own drive.