The way I read it, he hasn't got an Uno, he's trying to make a standalone.
Well, he said he had a Pro Mini and a USB to TTL module. I hope he has been practicing with them and figured out the auto-reset to download situation, depending on which USB to TTL module he has obtained - some are designed properly to do this and some require modification.
Point is that combination equates to a Uno and that as it already uses a 328, there is no problem implementing the "Arduino as ISP" sketch anyway, nor would there be if he was using any recently sold Uno. He was just a little unsure about the meaning of that warning.
My advice is not to bother unless it's a learning thing. You can get Arduino Pro Minis on eBay for under $4...
Actually, US $3.58
Ah! Just in!
So you're telling me that i can use the Arduino UNO to program the ATmega8/168/328 processor just by replacing the ordinary processor from the UNO with the e.g ATmega8?
You do not need a Uno if you have a Mini Pro and the CP2102 module. Of course you cannot exchange the processor on the Pro Mini anyway as it is SMD. What you can do is to use the Pro Mini - exactly as you would a Uno with the corresponding connections - to program an ATmega328 or arguably, the other versions by putting them in a separate breadboard (with a crystal and its capacitors) as described in Nick's article. You can use another Uno as the "breadboard", but just a breadboard and the crystal etc. will do.
Then i can use the ATmega8 like this?:
When it is programmed, you can use it in the usual fashion.
Must ask: Have you been practicing sketches yet with the Pro Mini and the CP2102 module?