Unless you have plenty of experience of working on devices like modern smartphones or tablets (and, let's face it, you wouldn't be asking this question if you had), you should think long and hard before attempting something like this.
Modern smartphones are very difficult to take apart and reassemble. I have been taking electrical and electronic devices apart for 40 years and have almost always been successful at fixing things that were fixable. My recent experiences of fixing an iPad and an iPod has led me to decide that I shan't be trying anything like this again.
Unless you are prepared to run the very real risk of completely destroying your phone, you would be well advised to pay someone else to do this for you.