I dropped my iPad on the corner and it shattered the entire screen.
Small Break = No Problem. Shattered = Difficult. It went well and not really that difficult normally, except my screen was extremely shattered so it was hard to remove the individual pieces of glass. If it only had a couple cracked areas then the repair would have been easy.
When looking at the instructions online while repairing the iPad it says you can order special double sided tape. Don't panic! There is tape already mounted on the new screen. All you need to do is remove the protective tape. Also, make sure to oder the tool kit, because it is only like $5.00 extra. I had to buy a Heat Gun.