required beforehand: a prerequisite fund of knowledge. something prerequisite: A visa is still a prerequisite for travel in many countries.
This can get a little pricey -- an iPhone 6 screen repair kit costs about $150 -- but it is cheaper than buying a new phone altogether. Of course, not all of us have the skills or time to fix our own phone screens.
In reference to your Ballpark Idea : I have just gotten off the phone with Dell in regards to replacing my screen. It is cracked in the corner but still in working condition. Dell Venue 8 Pro. For them to replace the screen I was quoted $269.00. Per Dell, and the tablet is still under warranty, but their warranty does not cover accidental damage, so I am assuming that not much is really covered. Upgraded warranty I have no idea.