Switching the screen on iphone 5; All you need is 3 minutes:
A 5-point screwdriver, a replacement monitor for your iPhone 5 and a sucker (which may be equipped with screen). Amazon can be a good place to look for these parts, though a new iPhone 5 screen and digitizer frame unit seems to be somewhat pricey.
Here’s a video that shows how quickly and easily you can do it:
If you thought that things are going a little too fast on the above video is here one from iFixit that go more in depth in a 32 minute video: