[Q] What will I lose if I go with Lollipop? topic

Hello Note 4 Friends (:

So I recently rooted my Mom's Galaxy S4 for fun, and installed a Lollipop ROM. It's Cool AF and I want stock Lollipop on my Note 4!

Before I go on with rooting my device and installing the custom rom, I have questions! (:

1. What will I lose if I go on with rooting then installing a stock Lollipop ROM? Will my S Pen literally not do a thing? Will the IR Blaster on the top of the device not work even with apps from the play store that control the IR blaster? Basically, what will I lose and not be able to replace or find very similar alternatives to? (IE: I can easily replace S Health)

2. How safe is it to root and install roms on the Note 4? I've rooted several devices in the past and installed custom ROMS, but it was well after their original release date. With the Note 4 being somewhat, recent, how safe is it, and are the ROMs *perfect* (Nothing Broken)?

3. Can I essentially "Save" my device completely before I install a custom ROM? If I really dislike the rom for some reason, is there someway I can have an exact save of my device with Stock Samsung Touchwiz, etc etc? All my apps and everything saved?

4. Are you rooted? Using a custom ROM? Lollipop? I'm curious as to how your phone is set up, and let me know why!

5. Do you recommend a certain thread on here/way for me to root my device, and also do you recommend a current Lollipop ROM that is very stable and very.. "stock Lollipop?"

Thanks everyone, XDA is always awesome d:

Have a great day and smile if you're reading this because it would make me happy ^_^