As long as you keep the stock for 3 day from the first sell.your ok. Since you are already a long holder that shouldn't be a problem. I also was afraid of the dreaded margin account because of the "evil" margin call but since you can't trade these on margin there is no problems to worry about. Your broker will be able to explain better then me, what company do you use? I use etrade and am very happy with them but there mostly all pretty good I would expect.