Need a tutorial to replace Touch Screen

My touch screen on my New Nintendo 3DS XL has a lot of dead pixels and and the bottom right corner (not a huge area, but large enough to annoy me) is broken. I'd like to replace it with another screen I have that is perfectly fine.

Are there any good tutorials of how to replace just the bottom touch screen and put it back together properly? I worry about doing it myself right now. I did take apart another 3DS XL that was broken (Friend's that broke and he kept) and in taking it apart, with how it is so put together, not sure I could put it back together so well without a good set of instructions or help.

I know there's one that shows taking apart the 3DS as a whole, but I don't want to do that exactly and hoping I could take it apart without taking everything apart.

Also, wish I could back up all my data for my 3DS XL on my PC just in case something goes wrong and I could buy a new one. Pity Nintendo isn't as good as Sony in that regards of backing up and duplicating your saved data elsewhere.