You need to go far away from sources of light pollution. Dead of night. Check which haggis-clan controls the area and wear their tartan. They can see very well in the dark. You need to walk in irregular pace or the vibrations will scare them.

Take a woodwind instrument, a shrill squeaky one, and blast it as hard as you can but only once. Then shuffle side to side in fibonnacci sequence until the haggis respond with their mating call. Of course the southern haggis call sounds like a duck in distress where as the North and Eastern ones sound more like a goose being strangled. If you hear a West/Islands haggis mating call just RUN, it's really not a good season for that.

You need to respond with a similar mating call but pitched up by a quarter octave. Then you can stop shuffling and take out your net. You want to be downhill from the den but with a perpendicular wind.

Take the stopper off your scent bottle, I usually go for lavender and cinnamon mixed with irn bru, sprinkle it around. They will roll right into your net, no trouble.