+Sabeeshan Kulenthiran Samsung does not lock the bootloader so rooting is very simple. It is probably just a couple of clicks using Odin. It was very simple on my note3. Once you get it unlocked and install super user you can leave the stock ROM and just remove what you don't need. If you can read and work a mouse it is very simple. And if you're not sure what you can delete then just flash a stock debloted custom ROM. I'll find some links for you if you're interested.
REALLY sucks that they can't tell then and there (at least approximately) how much of the bill money I can claim. AND having to always claim bills in person or by mail, no online options, which century are there guys living in?