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Root Too scared to root lol

As others have said, don't be scared. Just don't bother updating your Radio as this is really the only thing that can brick your phone if it goes wrong. And make sure you do a Nandriod backup first and copy it somewhere safe on your computer so you can always revert if you want to.

What means "brick your phone"? You wont be able do do nothing? It will be dead?

If you do a Nandriod backup, and the update of the radio goes wrong, can you revert to the last radio? Or the Nandroid backup doesn't include the radio?

And what do you gain by updating the radio? Cant you run a Custom 2.1 ROM without updating or doesn't your GPS work?
 
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What means "brick your phone"? You wont be able do do nothing? It will be dead?

Yes, that's what it means. It becomes essentially a brick., hense the term.

If you do a Nandriod backup, and the update of the radio goes wrong, can you revert to the last radio? Or the Nandroid backup doesn't include the radio?

No the Nandriod backup only backs up the ROM and optionally your ext partition if you use APPS2SD, it's does not backup the radio.

And what do you gain by updating the radio? Cant you run a Custom 2.1 ROM without updating or doesn't your GPS work?

The gain you get from updating the radio seems to vary from person to person but most people report better signal and better battery life with the latest radio (63.18.55.06JU_6.35.09.26).

It's not necessary to update the radio to install a 2.1 ROM. I didn't initially but decided to after a while and it did marginally increase my signal and battery life.

I would suggest as you are new to the whole rooting custom ROM lark, don't update the radio for now. You can always do it later on if you wish.

The most important thing to remember when doing a radio update is always check the MD5SUM is correct (Google MD5 for more info) before proceeding and DON'T INTERRUPT IT as this is what will brick your phone.
If necessary leave the phone overnight, never pull the battery.

For the installation of a custom recovery partiton and custom ROM the chances of bricking the phone are minimal. In fact you have as much chance to brick it as you would with an official update. If the recovery partition update goes wrong you can still get into the ROM to re-flash it, if the ROM update goes wrong you can still get into the recovery partition to re-flash it. If the radio update goes wrong, you are screwed.
 
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