A friend of mine cracked their screen, asked me if I could fix their phone after seeing my little pro tech toolkit. I joked that i'd fix their phone if they gave me the parts, and i got taken up on the offer.
Repair was 2 hours in total, the most painful part of it all was releasing all the god awful adhesive that Apple likes to use.
Make sure you have a good pair of tweezers. Apple's tiny 1.4mm screws are a pain to handle with pudgy fingers.