Is it safe to install Service Pack 1 update on an already dual booted windows 7 and ubuntu 14.04? [closed]

I wanted to install the Service Pack 1 update on my already dual booted Windows 7 and Ubuntu 14.04. I just wanted to make sure if doing this is safe or not? I had followed this tutorial to perform the dual boot. After following the tutorial I was booting directly into Windows and had to use boot repair and grub customizer to fix the related issues. Any suggestions as to what I must do to prevent any problems that I might encounter?

Edit - Please allow me to delete this question from here before I can post it on superuser.

As Rinzwind says, backup, backup, backup. Have an Ubuntu live-media available to reinstall grub (very likely). Know the sector start/end of every partition on your disk (may ease recovery of a working filesystem in some cases). Know the packages you installed, so you can recreate the system from scratch (backup usually applies to just your files, but setting up a customized system is not necessarily trivial). Assume the worst, and be ready to recovery. Maybe absolutely nothing will happen to grub or your partitions/files, but maybe they will all be grabbed by Windows and made into "Recovery" partitions -- be ready to deal with that.