Try it on wet ground for less friction to start the skid
Starting out I actually hopped up the back wheel a good inch or 2 to start the skid.
Now I have it down when were I just lessen the weight on the rear wheel by leaning off the seat a bit to start the skid. And i can do it pretty fast too. Have to work on the other leg tho, then it means 2x the skid patches!