If you want to use the scripts read first and make changes according to your needs.
Create 2 partitions (in cgdisk for example) 1 'boot' 500MB ef00 and 1 'root' 8300 for the rest and either:
curl -O https://raw.githubusercontent.com/fov95/install/main/P407_install; chmod +x P407_install; ./P407_install
OR
pacman -Sy
pacman -S git
git clone https://github.com/fov95/install
chmod +x install/P407_install
./install/P407_install