Challenging but worth it
I got a free Dell 3570 with a cracked screen. Replacing the display panel involves complete disassembly of this laptop, so it is not for the faint of heart. The replacement panel was $50 from bliss, and they made sure I was ordering the right part. While there were a lot of steps to taking the laptop apart and putting it back together, none were very hard and the instructions on dell.com were pretty good. I used an anti-static mat, and carefully organized the screws in sets for each component removed - and this proved essential. It took me a total of 4 hours. I'm pretty sure, with a lot of practice, I could get it down to an hour.