Will the beta software mess up my iPhone 4?

I wanna download the beta software so I can get iOS 7 but scared it gonna mess up my iPhone 4 will it

Yeah.

The beta itself is pretty stable. The only way you'll have a problem is if you don't get your iPhone's UDID registered on a site like http://www.instantudid.com/.It's $5 and they register your UDID with an Apple developer account. If you don't do this, Apple will disable your device for running unauthorized firmware.

No, you can always revert back to iOS 6 anyway by putting the phone into DFU mode and clicking Restore in iTunes.

iOS 7 beta is stable but to install any beta properly you need your UDID registered at a place like http://ios6udidactivations.com

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