[README update] Clarify archinstall upgrade steps

README.md

@@ -18,26 +18,45 @@ The installer also doubles as a python library to install Arch Linux and manage
 > In the ISO you are root by default. Use sudo if running from an existing system.
 
 ```shell
-    # pacman-key --init
-    # pacman -Sy archinstall
-    # archinstall
+pacman-key --init
+pacman -Sy archinstall
+archinstall
 ```
 
 Alternative ways to install are `git clone` the repository (and is better since you get the latest code regardless of [build date](https://archlinux.org/packages/?sort=&q=archinstall)) or `pip install --upgrade archinstall`.
 
+## Upgrade `archinstall` on live Arch ISO image
+
+Upgrading archinstall on the ISO needs to be done via a full system upgrade using 
+
+```shell
+pacman -Syu
+```
+
+When booting from a live USB, the space on the ramdisk is limited and may not be sufficient to allow running a re-installation or upgrade of the installer.
+In case one runs into this issue, any of the following can be used
+
+* Resize the root partition https://wiki.archlinux.org/title/Archiso#Adjusting_the_size_of_the_root_file_system
+* Specify the boot parameter copytoram=y (https://gitlab.archlinux.org/archlinux/mkinitcpio/mkinitcpio-archiso/-/blob/master/docs/README.bootparams#L26) which will copy the root filesystem to tmpfs
+
 ## Running the [guided](https://github.com/archlinux/archinstall/blob/master/archinstall/scripts/guided.py) installer
 
-Assuming you are on an Arch Linux live-ISO or installed via `pip`:
+Assuming you are on an Arch Linux live-ISO or installed via `pip`, `archinstall` will use the `guided` script by default
 ```shell
 archinstall
 ```
-
-## Running the [guided](https://github.com/archlinux/archinstall/blob/master/archinstall/scripts/guided.py) installer using `git`
+similar goes for running the [guided](https://github.com/archlinux/archinstall/blob/master/archinstall/scripts/guided.py) installer using `git
 
 ```shell
-    # git clone https://github.com/archlinux/archinstall
-    # cd archinstall
-    # python -m archinstall $@
+git clone https://github.com/archlinux/archinstall
+cd archinstall
+python -m archinstall $@
+```
+
+To run alternative scripts using the `--script` parameter
+
+```
+archinstall --script <name>
 ```
 
 #### Advanced
@@ -139,12 +158,6 @@ The profiles' definitions and the packages they will install can be directly vie
 If you want to test a commit, branch, or bleeding edge release from the repository using the standard Arch Linux Live ISO image,
 replace the archinstall version with a newer one and execute the subsequent steps defined below.
 
-*Note: When booting from a live USB, the space on the ramdisk is limited and may not be sufficient to allow
-running a re-installation or upgrade of the installer. In case one runs into this issue, any of the following can be used
-- Resize the root partition https://wiki.archlinux.org/title/Archiso#Adjusting_the_size_of_the_root_file_system
-- The boot parameter `copytoram=y` (https://gitlab.archlinux.org/archlinux/mkinitcpio/mkinitcpio-archiso/-/blob/master/docs/README.bootparams#L26)
-can be specified which will copy the root filesystem to tmpfs.*
-
 1. You need a working network connection
 2. Install the build requirements with `pacman -Sy; pacman -S git python-pip gcc pkgconf`
    *(note that this may or may not work depending on your RAM and current state of the squashfs maximum filesystem free space)*