Cloning in soil is very possible with a high success rate.

1. Make sure the mother plant is mature enough to give clones.
2. Cut clones from the right area of the mother plant.
3. Re-cut the stem of the clone under water at a 45 degree angle so you dont get any air bubbles and maximum root development area.
4. Coat the freshly cut area in Clonex (the best Ive used) rooting hormone.
5. Plant in 'seed sowing compost' and place in a propogator that maintains a constant high humidity.
6. Keep moist and importantly - LEAVE WELL ALONE. Dont dig them up.. disturb them to see how they are doing, dont fiddle with them. They will look as though they are doing nothing. It takes 2 weeks or so until roots start to really make progress.

Good Luck!