Yes, Kerry is beautiful! We had a beautiful week of weather last week, this week is a little more rainy. Try to make it up to the Dingle Peninsula if you have the time -- it's a lovely place!
Once you've had some practice at sweaters, you'll often decide to change how a pattern is made -- it will just depend on what you want to do and the results you want to get, which is partly what makes knitting an art instead of just a craft!
You don't have to do two sleeves on a cable -- you can also simply knit one sleeve on one set of needles and the other sleeve on another set of needles, as well! If you do that, though, remember that often you'll get different results from different kinds of needles, so watch out if you knit one on metal and the other on wood!