Voltage to % on lcd screen

Hi!
I don't know anything about arduino. I want to achieve this Stigern.Net » Blog Archive Getting RSSI from your Lawmate RX-1260 - Stigern.Net

I know how to connect the wires in my video rx. The problem is thaT I don't know how to connect to a lcd screen and convert the voltage to %.

First of all I would like to know if it is possible for a persob like me that I don't know anything about arduino.

Second: what components I need? Links?
Finally how to connect and program.

Thanks in advance!

You need an Arduino and you need a 1602 display.
And you need a power supply.

You need to read and learn a bit.
You can find how to connect a 1602 display to your Arduino right here on the site.
I'm not going to describe that, its dealt with every single day over here so easy to find.
You can make your program by using the IDE, which can be downloaded right away from this site (see the Download button in the top bar ?).
You do not need the hardware to start playing with that.

There's a bunch of examples immediately available after installing the IDE.
You will learn from that.