NEM is one of the cryptocurrencies that I believe in(POI algorithm, the team, community, use cases, the idea behind the project, etc..), and the latest growth of this project shows others' trusts in it as well(it won't stop here,. as advised I don't like to keep my cryptocurrencies(the ones I am in for a long term investment) on an exchange server, so I use a standalone wallet offered by official NEM site, in this tutorial you are going to go through the steps to make a Node/Wallet up and running on Linux.

Installing java >= 8

(if you are behind a proxy, you need to use -E after sudo to keep your current user's environments)

sudo -E add-apt-repository ppa:webupd8team/java -y

If you get an error like this picture, execute the next command, otherwise just skip it

sudo -E apt-get install --reinstall ca-certificates

now try these two commands

sudo apt-get update
sudo apt-get install oracle-java8-installer -y

NEM Client

go to the official NEM project page and download the source

Download page

extract the file in a directory named NEM(or any other directory you like of course)

tar zxf nis-ncc-0.6.87.tgz

note that the extracted directory is called package

cd package
nohup ./nix.runNcc.sh & nohup ./nix.runNis.sh &

if you want to see the logs, just execute the scripts without nohup and & sign

./nix.runNcc.sh

on another terminal

./nix.runNis.sh

the result should be something like this if you removed nohup

(there is also a nix.runMon.sh file that you can run instead of these both files, but I have seen lots of people having java related problems with it, so I would not recommend it, your call)
now go to a browser and open following link
http://127.0.0.1:8989
if everything goes as plan, you will see this page

now you have two options, creating a wallet or restoring one
creating is simple, just give your wallet a name and password

to restore a wallet you need a *.wlt file, just put that file in this directory(nem directory will be created in user's home directory, go to ncc and paste the wlt file there)
/home/meysam/nem/ncc/
after doing it, you will see your wallet name

if you have 100000 xem and you keep it for 10 days or 100000 nem for 1 day(your vested balance must pass 10000), then you can start harvesting which is basically getting transaction fee based on your account's importance(the amount of xem, you hold and the number of transactions you make), you will have two options of harvesting
local = you become a nod and harvest while you are online
delegated harvesting = you make a transaction with the amount of 6 xem, wait for 6 hours(380 blocks) and connect to a remote server, you don't need to be online anymore and you can do offline harvesting.
to connect to a remote server click here and choose a server based on your location

now go to setting and just add the address instead of localhost, this way you don't need to download the whole database

IMPORTANT!

before making any transactions, please backup your wallet and keep it in a safe place with any method that you see fit

it will export two files including the *.wlt file which you need for restoring your wallet later on.

Conclusion

for some people these steps are so easy and they don't need any assistance(the tutorial itself is on NEM site too), but there might be some difficulties that might irritate others, that is why I tried to address different problems that anyone might face. give NEM a try, it will be huge down the road(not just limited to price)

I do appreciate your upvotes,thoughts and resteems

Thank You

@meysam