Root New OS, What to expect?

[Gylenthal]

I have a ZTE Blade D6 Lite 3G phone, which is as far as I am concerned rife for the waste bin.
The phone is locked by the provider (DTac) and can only be operated with a SIM card of that provider.

I have rooted the phone already with Kingsroot and wiped a lot of Bloatware out.

My next plan is to replace the Operating System to a Mod-operating system.
The Cyanogen website has a complete Operating System for this phone (cm-7-20130301-NIGHTLY-blade.zip + ZTE_Handset_USB_DriverV5.2066.1.8.exe).

I have never done this before.
What can I expect to see when the Operating System is replaced by a Cyanogen (or eg.: Clockwork) Mod (pictures)?
Is that a difficult operation?

TIA

 

[Brian706]

I haven't looked at the process specifically for your device but it's generally pretty simple. Is there a custom recovery for your device? If so, the process is generally this:

-install custom recovery
-use custom recovery to make a full backup of the device
-use custom recovery to install custom rom

If anything goes wrong, boot into custom recovery and restore your backup