Funny thing about how the human hands work- they can hold onto something, clutch something, and they can release it. Try it with any object you care to experiment with.

I am assuming you are thinking about something you can hold onto- anything. Clutch it really tightly. Now imagine that there is something else you want to have instead-- something that is much more appealing- much better for you- and you know it.

So, the thing to do, the simple, simple... so simple that it might seem for the moment to be be ridiculous to even mention it ... is to release what you are clutching onto to get that instead.