Hi :)
Basically you need to:

    boot your computer with Gentoo Minimal Install CD
    create a profile
    download the script and start it.

Let me explain in detail:

1) Download a Gentoo Minimal Install CD from one of these locations:

for 32bit : ftp://mirrors.linuxant.fr/distfiles.gentoo.org/releases/x86/current-iso/install-x86-minimal-20140415.iso
for 64bit : ftp://mirrors.linuxant.fr/distfiles.gentoo.org/releases/amd64/current-iso/install-amd64-minimal-20140529.iso

2) Burn your downloaded iso file to a blank CD
3) Boot your computer using that CD
--- Wait untill everything finishes and you see the console ---
4) Execute this command to open an empty profile:
nano profile
5) Fill this file with your own choices:

--- !!! read this for all possible profile settings : https://github.com/shdcn/easygentoo/blob/master/profile !!! ---

An example profile looks like this:

keymap us

boot sda1 Boot
swap sda2 Swap

home sda3 Home xfs

root sda4 Root ext4
extra sda7 Temp reiserfs /var/tmp

extra sda8 Portage xfs /usr/portage
arch i686

grub             sda
type laptop

setup normal
domainname       venus
hostname         twister
rootpass Tbr3Va
username tiny

userpass kv693eRx
autonet no

blimit           625

It means that:

we want to use us keyboard layout

/dev/sda1 is our /boot partition

/dev/sda2 is our swap partition
/dev/sda3 is our /home partition and we want to use xfs filesystem for this partition
/dev/sda4 is our /root partition and we want to use ext4 filesystem for this partition

/dev/sda7 is our /var/tmp partition and we want to use reiserfs filesystem for this partition

/dev/sda8 is our /usr/portage partition and we want to use xfs filesystem for this partition

we want to install 32 bit Gentoo (i686)

we want to install grub to MBR of our harddisk (sda)

we are using this script on a laptop

we want to install a normal desktop system with Xfce Desktop Environment

our domainname is venus

our hostname is twister

we want to create a user called tiny

we want user tiny to have kv693eRx as it's password

we want to set root password to Tbr3Va

we want script to try reconnecting when we experience disconnections

we want to limit the download speed of this Gentoo installation to 625 KB/s

6) Save and close profile (press Ctrl + X, press Y, press Enter)

7) Download Easy Gentoo using this command:

wget https://raw.githubusercontent.com/shdcn/easygentoo/master/easygentoo

8) Make the script executable with this command:

chmod +x easygentoo

9) Start script with this command:

./easygentoo

That is all you need to do to start Easy Gentoo. It may look a little complicated but it is easier than it sounds. Hope these are the ansewrs you were looking for.
Feel free to write again when you have any problems. Have fun :)