It is so easy, that i made a 50 second video about it.

The video will show you how to Juan Tap, so it's important that you watch it before you read the rest of the guide, i made the video so you can visually see how easy it is, it's only 50 seconds long, and anyone can do what is shown in the video!

https://www.youtube.com/watch?v=xYlBHu2gdRI

The science behind it

Every human has their own reaction time or visual reflexes, you can test yours on this popular website.

http://www.humanbenchmark.com/tests/reactiontime

You use your visual reflexes in every frame of your life, so you also use your visual reflexes in every frame in csgo.
So what we can do is abuse how good our visual reflexes are and simply rely on them to hit a shot in CS:GO, when i said "Hold the angle to your reaction time", what i meant was to ensure you are holding the angle wide enough so your visuals have enough time to react to what's on the screen. If they do you're brain can process functions a lot easier, such as pressing a button, rather pressing the shoot button when the body of the enemy enters your crosshair.

You noticed i didn't move my crosshairs what so ever, i simply relyed on my reaction time to hit the shot, which is what makes hitting this shot so easy. You should try it.

The problem with this technique, is that what if the enemy doesn't peek wide? In every example the enemy peeked wide. Well rather than holding the angle wide, hold the angle to where you think the enemy will end up and just shoot when peeks.

It's really is easy is it not?

I have 200ms of reaction time in CS:GO, so what you saw me hit in CS:GO was 200 - 250ms shot's, so use my crosshair placement as an example of where to place your crosshair.

My friend mashable also has a similar reaction time to me, so he placed his crosshairs in the same place as me most likely.