How to get iOS 5 on my iPhone 3GS without jailbreaking or damaging it?

I have an iPhone 3GS and I wanna get iOS 5 on it BUT I don't wanna jailbreak it or do anything that could mess it up.

Yes the iPhone 3GS has support up to iOS 5.1.1. Just plug the iPhone into your computer, open up iTunes and click "Check for update" or "Update" when your iPhone pops up on iTunes. It will download the latest firmware, iOS 5.1.1, onto your iPhone 3GS. There's no jailbreaking and it is completely safe.

Just update to ios 5.