Im just scared if I take out the HU, the CD, Radio and everything on it stops working! cuz i read couple of comments about it, some tried to take out the HU to install stuff, they messed it up somehow, what do you suggest?

 

Even if you LCD unit is bad, you still need to remove the HU anyway to reach the connector behind the HU.
So either way, you need to remove it.
Follow the link I posted earlier that had a great DIY on how to remove it and you'll be fine.
Not saying its simple because it can be a PITA if you've never done it before.
The two connectors behind the temp controls are a little awkward to get at since you need to push in the tab and pull down (while your wrist is twisted).
Then when you pull the HU out it feels like you're about to break it in half, but you really need to wiggle and pull hard to get it out.
And don't forget about the "hidden bolt".

Again, print out the DIY, follow it, and take your time.