updated README.md

Made the README user friendly while at the same time scaring people with
hacker jagon.

README.md

 # Plymouth Random Theme
 
-Change plymouth theme to a random theme twice every week. Consists of a python script and systemd timer.
+Change plymouth theme to a random theme twice every week, while ensuring
+the same theme won't be set multiple times. Consists of a python script
+and systemd timer. This script assumes you have lots of themes installed.
+If not, try [the plymouth theme collection by
+`adi1090x`](https://github.com/adi1090x/plymouth-themes)
 
 ## Installation
 
-``` sh
-sudo make install
+Clone this repo to your system:
+
+```sh
+git clone https://git.fosscommunity.in/perry/plymouth-random-theme.git
+```
+
+Now cd into it and install with GNU Make:
+
+```sh
+cd plymouth-random-theme
+sudo make install && sudo systemctl enable --now plymouth-theme.timer
+```
+
+Please do not poweroff or reboot your system immediately after installing,
+as it may fail to boot. Changing a theme involves updating the initramfs,
+which takes some time even after the above command has executed. Wait a
+few minutes until `plymouth-theme.service` deactivates successfully. You
+can check the status to see if it finished updating:
+
+```sh
+# Easiest way
+systemctl status plymouth-theme.service
+
+# Or if you want live updates, use this instead
+# Press Control+C when you're done
+journalctl -fu plymouth-theme
+```
+
+## Uninstalling
+
+```sh
+cd plymouth-random-theme
+sudo make purge
+
+# or if you want to keep the config file:
+sudo make uninstall
 ```