Answer to: Do I need digitizer or screen replacementI just replaced LCD + Digitizer on my wife's. Her digitizer was shattered, and I was unable to separate it from the LCD because it was so shattered, in fact, i tried, but ended up ruining her LCD. The LCD+Digitizer itself is fairly straight forward to replace, the hardest part was getting the battery out.
Answer to: Cracked glass. Where to purchase?I bought mine here: http://www.ebay.com/itm/361132613456?_tr... quite happy with it. But, I did LCD + Glass. Doing just the glass is much harder.
Answer to: How to insert new battery in a BLU Dash 4.0 phone?you can follow the videos on youtube for tear-down of a 1520. Getting to the battery isn't even that hard, but getting the battery out is a little difficult, but just be patient. You may need some new double sided tape to hold the new battery in place. I would say this is a medium-low difficult installation.