How does one restart something entirely, magick related?

[exarkuun1991]

Crap. Accidentally got a little too emotional and began some black magick..on a Gemini. That's apparently not a good time to begin or do black magick.
Well this is something I must do. The next sign is Cancer, which tends to make things last (and that'd be good), so I'm not doing any more on this working until Cancer..
but how do I actually stop, to restart in a better sign? that's my question. I cannot let this get screwed up.