How is Tahajjud prayed?

I never prayed Tahajjud before. Now I have found out about its importance and reward. But I am having some misunderstanding regarding how to pray it. Let me explain with real example. I was praying like this (When I didn't pray Tahajjud): **Isha** (for example at 18:30) - 4 rakats Fard - 2 rakats Sunnah - 3 rakats Witr **Fajr** (for example at 6:40) - 2 rakats Sunnah - 2 rakats Fard ------------------------------------------------- And Yestersay I prayed like this: **Isha** (18:30) - 4 rakats Fard - 2 rakats Sunnah - 3 rakats Witr **Tahajjud** (at 2:00) - 20 rakats **Fajr** (at 6:40) - 2 rakats Sunnah - 2 rakats Fard ------------------------------------------------- **But** Today I read that after Tahajjud I must pray **Witr**. Which Witr is referred here is confusing me. The one I was praying in Isha or **is it a separate Witr**? **For Allah's sake, can anyone help me to understand how to pray Tahajjud and what kind of Witr I must pray in the end?** **Additionally, the sources about Tahajjud are saying that Quran must be recited as well, as much as possible. Please, tell me where I must read Quran?**