How to download iOS 6.1.4 in order to download iOS 7?

I've read that in order to download iOS 7, I must have iOS 6.1.4 on my iPhone 4. I only have iOS 6.1.3, and so I was wondering if there was a safe way to download this software in order for me to download iOS 7?
Also, does anyone have iOS 7 on the iPhone 4 yet? I was wondering how it's affected the general running of your phone, as I don't want my phone to be slowed down.

Bro don't update on the iphone 4 until apple sort this *** out. People have been complaining that their iphone 4 has been slowed down by at least 50% some even worse. But if you want to risk it then go to this site http://www.felixbruns.de/iPod/firmware/ and download the required.ipsw
Then plug your phone in and on itunes keep hold of ctrl or alt or cmd depending on what computer you have and click on restore. Then select the.ipsw you have just downloaded and it will install the new update for you.

ps. If you do that make sure to back up just incase anything goes wrong.

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