Update readme with better details of how to use.

README.md

@@ -1,4 +1,4 @@
-LMDE Expert Mode Installation Helper Script
+# LMDE Expert Mode Installation Helper Script
 
 Used to provide good defaults to LMDE to install with or without encryption, hibernation support, and with BtrFS subvolumes.
 
@@ -16,3 +16,35 @@ Options:
 -s, --swap        Enable Swap/Hibernation support.
 -d, --debug       Enable DEBUG mode for testing.
 ```
+
+## Initial Setup
+
+To prepare your disk for this, you need to pre-create the paritions needed as you have to supply those partitions to the installer.
+
+Do this using cfdisk or GParted from the live media of the LMDE environment.
+
+You will need:
+
+* 100MB for /boot/efi as FAT32 with boot+esp flags.
+* 2GB for /boot if you're using encryption, otherwise you can supply @boot to the installer.
+* Remainder for / as BtrFS
+
+## Installation
+
+Run lmde-expert.sh with appropriate parameters. An example of this for NVME-based SSD, and Encryption with Hibernation:
+
+`./lmde-expert.sh /dev/nvme0n1p3 /dev/nvme0n1p2 /dev/nvme0n1p1 -e -s`
+
+This will start the provisioning setup, with the full expectations that the system is ready to go as-is, as it will format. You will get one prompt before it actually starts.
+
+## Expert-Step
+
+After the installation gets to the step where you run the "expert" portion, you can run this again with the --expert flag, and it will finish the installation steps during this phase.
+
+## Post-Installation
+
+After you've installed and booted for the first time, to get BtrFS Snapshots setup, you can run the postinstall script:
+
+`sudo ./lmde-postinstall.sh`
+
+This will simply install and setup btrfs with snapshots and create your first snapshot automatically.