Need some clarification please - Sony Xperia P, U, Sola, Go

Hi guys,
I thought I rooted my phone succesfully, but after installing "Fasterfix" from market it said "can't get root".. but I think I know where the problem lies.
Let me explain the situation.
phone:
Sony Xperia U
ST25i
Kernel-version: 2.6.35.7+
Build-number: 6.0.B.3.184 (It was initially 6.0.B.1.... I used SEUS before rooting..)
I'm planning to root my phone so I can use couple of apps to the fullest, that need root acces.
I followed this guide to unlock bootloader: http://www.xperiaplanet.nl/unlockbl.html
I downloaded & installed the fastboot drivers AND the fastboot binaries from: http://forum.xda-developers.com/showthread.php?t=1526866
I followed this guide to root: http://www.techclap.com/9935/root-sony-xperia-u-lt25i-phone-tutorial/
I used the Stock Kernel for Xperia U from this thread: http://forum.xda-developers.com/showthread.php?t=1717270 (this is probably the reason why it is not rooted? I flashed my phone with a non rooted stock kernel?..)
The questions:
1. All the nessecary downloads, the drivers, binairies, kernels, etc etc..., are these made/Edited by users and non official devs, or are these from Sony officially? How can one be sure these things we install on our phone are safe without malicious code? In the end it's made by non-official Sony devs. Correct me if I'm wrong here, I don't want to kick someone in the shin..
2. Why aren't those downloads (drivers, binairies, kernels, etc etc.) not linked to the offical sony website?
3. To just have a rooted phone, without the extra bells & whistels most kernels and roms come with. Is it enough to flash with a stock kernel, like I did?
4. How can I undo everything I have done, and have my stock phone back?
5. When rooted, can I still have an official auto update to ICS?
Yes I have red most of the sticky threads, but still.. I need some help.
Thanks in advance,

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Is there an app called superuser in the app drawer?
Sent from my LT26i using Tapatalk 2

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Ben36 said:
Is there an app called superuser in the app drawer?
Sent from my LT26i using Tapatalk 2
Click to expand...
Click to collapse
No, there is not

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Then its not rooted. The kernel mustn't have flashed, did you def unlock the bootloader ok?
Look for the Xperia S guides as it's the same method, just use a U kernel instead
Sent from my LT26i using Tapatalk 2

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Ben36 said:
Then its not rooted. The kernel mustn't have flashed, did you def unlock the bootloader ok?
Look for the Xperia S guides as it's the same method, just use a U kernel instead
Sent from my LT26i using Tapatalk 2
Click to expand...
Click to collapse
Okey thanks m8.
yes the bootloader is unlocked. It says so in the service info menu.
I'll try the flash later. First I want to know for sure if all my date is going to be safe.. I mean, is it safe to use email and other confidential things on a phone that is flashed with custom (non-official) apps and drivers that are made by non-offical people.. I find so very little about security on these topics.. It's like everybody is just flashing and installing third-party software like its nothing.. But you can never now.. What if a dev puts malicious code in a dowload (like the fastboot drivers, fastboot binaries, kernel, ...) that will send thrusty info to him/her..
Can somebody please clarifie this for me?

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Just download su from the market and then any root checking app. Maybe you already have root and are just missing the superuser app.
I had to install a superuser app myself too but I rooted with another method.
Gesendet von meinem LT26i