RCS. It helps a lot. Also, try to equip your orbit stages with gimballing engines; you can turn off RCS while burning, thus saving a bit. Also, your ship will seem to spin as you go around Kerbin, because you\'re pointing at a certain heading. I\'m not quite sure how to explain it, but say that point is on the other side of Kerbin. Your ship will point at that point while it\'s orbiting Kerbin in a circle.