Installation problems for iOS7 for iphone 4?

I have an iphone 4 im trying to install ios7 and it isnt going threw i have been trying for 4to 5 hours.
i have the software downloaded on my phone, but when i got to install it, it doesnt go threw the verifications. It says try again later.well i did. I went threw it went to the screen with the apple got about 1/3 of the way threw.froze. Then cancled and i had to re download the software. Any ideas whats going on?
i got my phone about 4 months

So many people are trying to get it at once.

It will take forever… It will probably be better tomorrow