Where can I find a step by step (with no specialist words) tutorial for rooting my Galaxy S3 Mini (i8190)?
root your S3 mini without any download of a new firmware
There are many tutorials on the net you just need to Google it.
Here is one: http://forum.gsmhosting.com/vbb/f777/root-step-step-manual-i8190-n-l-t-i-galaxy-s3-mini-1640319/
I have not rooted my phone so have no idea whether or not the instructions work so follow the instructions at your own risk.