Just do what you wrote, simple as that :)
Yaru instructions here: <
**Installation :**
> 1. Just unzip the file and place it in your themes directory i.e. ~/.themes/ or /usr/share/themes/
>
> 2. Install gnome-tweak-tool sudo apt install gnome-tweak-tool
>
> 3. Select the theme as 'Yaru-light' or 'Yaru-dark'
>
>
**Font :**
> Install this package `sudo apt-get install ttf-ubuntu-font-family`
>
> Open **Gnome tweak tool** ( _Tweaks_ in apps) and select _fonts tab_ on the left (if you do not have this program -> `sudo apt-get install gnome-tweak-tool`). Apply the _Ubuntu Regular_ and _Ubuntu Mono Regular_ fonts with the sizes like in the image below :
![enter image description here](