SN and benzo?

[crystalskies31]

Hi,

I have access to good amounts of benzo (the one beginning with V).
How much should I take with my SN one hour before. I don't mean an amount in grams but should I take enough to just make me sleepy or properly pass out?
Basically, I want to be awake enough to drink a second glass if I need to, eg if i puke. But asleep enough not to feel pain when the SN kicks in XD

Thanks