It usually takes about 1/2hr for Klonopin to kick in for me. I haven't experienced any side effects from it, aside from drowsiness, especially when taken when tired, or mixed with other sedating meds.

If you are concerned about how the 1/2mg dose will effect you, get in bed 1/2 hour after you take it...
And I would do as Bizi suggested, and take 1/4mg. I may not get a perfect dose, but I snap the 1/2 of a 1mg pill in half by hand if I want to take 1/4mg because I don't want to crush the pills. Not all pill cutters are created equal...

A lot of people with RLS say they find relief when they start taking Klonopin. I hope the same is true for you

Did you like the doctor you saw?