One technique my instructor first taught me to align the plane with the runway for landing was this ... Stand totally perpendicular to the runway, and only turn your head to see the plane as it's coming in for landing. You will see the plane over your shoulder (ie your head at about 60 degrees) and try to turn into final approach leg about the same distance each time. After a couple of attempts you will get the feel of where you need to see the plane when you turn in for final approach. Not sure if this description is clear enough for you, but I was all over the runway until I did this a few times. I later saw this better described in one of the popular RC books (which also described the slip), cant recall the name but can get if you're interested.