Can anyone tell me how to prepare uk heroin for injection?

[DeathIsJustAJourney]

So I got 20 pounds worth of heroin but don't know how to prepare it for injection,I've got jiffy lemon juice to break it down but how much do I use and how much water do I use aswell,I know it can only be litterely in the ml like either 1 or 2 ml citric and same with water but I've never injected before so totally clueless on it,any help and advice will be appreciated thanks