euro-style, down-tube across your shoulders.
Put bike across you, in front of you, facing to the left (ie chainset away from you)
Turn bars 90 deg to the right.
Put left pedal to the bottom.
without leaning over the bike, grasp right fork leg in your left hand and seat-tube in your right hand.
Pick bike up and over you head
Rest down-tube on your shoulders, or let it slide down to your rucsac if you have one.
you can always move your right hand to your left-crank for more leverage to steady it when its up there.
when you take it off, remember to lift it off you rucsac back onto your shoulders, and move your right hand back to the down-tube, then up and over your head and back down.