If you wish to preserve the LCD screen for whatever reason, it is recommended you use a heat gun around the sides in order to weaken the adhesive that keeps the screen in place

Take something thin, such as a knife, and wedge it between the screen and the body of the phone

One you have created some space, wedge your plastic opening tool into the space and remove the knife

Move your plastic opening tool up and down the side of the phone while lightly pulling up. Repeat this for all sides until the screen comes out

If you wish to preserve the LCD screen, be careful how deep you wedge the plastic opening tool in and how hard you pull up to get the screen out. Depending on the depth of the plastic opening tool and strength used, there is a high risk of damaging the LCD screen

Remove the old adhesive from the body and replace with new adhesive so the new screen will stay in place