Is it possible to resize root partition?

[Nyto]

[size=78%].[/size]
Hello.
My system is working properly, it is a LL 4.2 installation, and the partitioning is:



Device          Description
-------------    --------------------------
/dev/sda1    Boot, Ext4
/dev/sda2    Root, Ext4
/dev/sda3    Home, Ext4
/dev/sda4    Misc_storage, NTFS


I need to resize my root partition, but I guess it can't be done on a running system.
I know it could be resized by booting from a Live USB drive, but won't this mess up my installation, preventing it from boot?


I don't want to change the partitioning, I just need to allocate more space for said partition. Additional space is available on the same drive.


Can you guys recommend what to do?


Thanks!