Botulinum injections for foot spasm?

Has anyone had this done, and could tell me a bit more about it?

My Neuro has suggested this to help my foot and toes which presently curl downwards and cramp making walking very painful.

I wondered how painful the injections are as I believe they inject into the muscle. And also how much weekness you are left with? Do the injections go into the foot or leg? will I be able to drive home from having it done?

I do have these injections around my eye as I have blespharospasm but they are tiny.

I would be really greatfully if anyone can enlighten me on this proceedure.