What to know before making theme for System UI

Hi, i'm new here so i will start with easy threads :) .
1 month ago i wanted to explore System UI . I used one of XPosed Modules that can change everything in it . So i got idea to make a theme for my phone. I need to tell you what do you need to know before you start to theme it.

1. Thing to know
Before you start you need to root your phone. You have tutorial how to root on XDA page " Fastest way to root phone ". There you can choose phone brand and you will se tutorial. And your warranty is now void.

2. Thing to know
Make sure you have your original copy of System UI if you want to back to original theme. ( By doing this you skip reinstalling stock ROM, which is boring and unwanted )

3. Thing to know
You need to have idea how will your theme look. Try to look some completed themes on internet to get inspiration. Also start creating theme on your computer then import it to your phone.

4. Thing to know
Fourth thing to know is question. Why you would want to design your phone, while its beatiful at its original theme? :)


Thank You... I know its bad...