Broken Samsung Galaxy S4 screen.. (not working) need little help

I have Samsung galaxy s4. I have broken screen which is not working and it's completely dark. Am I right that I need to change digitalizer and LCD screen ?

I am looking to buy from ebay co uk, which one would be the best the genuine or other brand ?

There is many videos on youtube, is it that hard to replace on my own, as I have to take out camera etc. Is there any safety tips what should I follow ?

Thank you.