To save 20 bucks and spend up to almost 2 hours extra, you can replace just the front glass-digitizer.

First, heat up the glass so hot it is not possible to hold your hand on it for long. (80 - 100degrees celcius) A hot air gun or a heat plate is required.

Insert a razor blade in between the glass and the frame. Carefully start making your way around the perimeter of the screen, keeping the glass hot.

Once a cutting wire fits between the glass and the LCD, switch from razor blade to cutting wire, and keeping the glass hot to touch, separate the glass. I recommend researching this process further beforehand. Sadly, I do not have any pictures of the process for this device.

Now you should have exposed the digitizer film. This has to be pried off, and in my opinion the best way to do so is to use the same cutting wire method. Now, be extra careful with the heat gun. I recommend holding the phone in your hand when heating with a heat gun, this way you will feel burning before you damage the LCD screen.