Hello everyone, this is my first DIY so I'm sure I might miss a few things. Do let me know if I should be stating something more(or less )

I would like to first give a disclaimer that the below process is done purely on basis of experience, so if this is the first time your servicing your bike, just keep someone experienced nearby for immediate consultation/assist if required.

So to begin with, you have to first see what all you want to do. My "to do" list included the following:
1)Air filter change
2)oil filter change
3)oil change
4) Washing
5) Chain clean and lube

For doing the above tasks you would require the following:
1)4mm and 5mm Allen keys
2)Philip screw driver
3)17mm Socket wrench

This is how you should have your bike set up

The replacement stuff required.


We begin with taking up 2 tasks - removing air filter and faring.
There is one screw holding the cowling below the front seat, which can be opened using a Philip screw driver.
It's the one on the top left hand corner of this pic.

Once remove there are other 3 similar screws you have to open.

After this cover opens, you can simply remove the air filter by pulling it out. Ensure to block the air box with a rag cloth while you're in the process of replacing the filter. It is in a plastic frame which you might have to press with fingers if it creates hindrance while coming out. Avoid using force.
If you want to, you can use force to separate the frame from the filter once it is out. Just pull the sections on either side apart and they open up easily and look like

So you see how dirty it is(I honestly did clean it few months ago) but this is the one that came with the bike and the service centre never changed it.
To prepare the filter for replacement I used fresh engine oil and spread some over the filter. Squeezed it when covered with tissue to soak out excess oil. For the new one you just frame in the filter between the two plastic frames. It'll be a piece of cake.
Then you slip it back into place.

After putting in the new one, put the cover back on with 3 screws and then you can put back the cowling below the seat.

There is no need to remove the fairing if you don't want to clean it, you can do all remaining tasks with fairing kept on. I removed it to clean the inside of the fairing and the engine.
To open fairing there are 4x4mm screws and 2x5mm screws on each side which open with allen key. The fairing will not come out yet. There are 2 pin type clip fasteners and a 4mm allen screw at the front left and right side.
See the pics below for reference.

To remove the pins you can consider pulling the two parts of the fairing across while holding them from some place near the fastener. It won't break anything.
After this there are 3 more fasteners(clip type), one at the lower front of the faring and other 2 beneath the faring.


And yes wee will clean them as well. Just use water and an old tooth brush (which you will not use to brush your teeth)

Before pulling of the faring consider disconnecting the indicators. They would look like this:

This is a pic of the fairing on both sides.

I missed taking a pic of the naked Ninja as a whole, but I did manage to take a few clicks before and after cleaning the engine. Here goes:
Before

After


Now for oil filter replacement and oil change.
To remove the filter there is a 17mm bolt below the engine which looks like the one on the left of the pic below.
The hole you see in the middle of the pic is the drain bolt. There are 2 drain bolts than one. The 2nd one is on the right of that dirty part you see in the pic. All three open with same size socket wrench.


I missed clicking the pic of the filter but it's a pretty easy procedure, just remove old one>clean the whole assembly with tissue or rag>put in the new one the same way. It does come with a removable spring, a washer and top cover. Ensure they are in the same order when putting in the new one.
Now you drain the oil.

Once this is done dripping, you plug in all the bolts and put in the engine oil by opening this cover by hand.

Once the oil is poured in, check the level through the small window on the right.

The oil should be between the top and bottom levels indicated on the right of the window for reference.

Now for the cleaning. I usually don't use pressure water for cleaning. I prefer bucket of water and a cloth which doesn't cause too much of a mess.
Recently the bike got a little mucky driving through water on the road, but now it's clean.


Now after the cleaning, we move on to Chain cleaning and lubrication.
I mentioned on the Ninja thread that I'll use a Motul chain cleaner, well guess what, it's empty. So I had kerosene oil and a "rustfree" can. I used the same tooth brush and kerosene 1st then rust free to clean the chain.


After this we put the fairing back on after cleaning with damp cloth, connect the indicators back to the circuit, screw all the fasteners and check for any missing screws whatsoever.

Now before we go for a test ride, we check the air pressure. Front one was good to go, rear lacked some air..so I filled that up and were good to go.


Before you take your ride out for a test drive, ensure all your tools are back in place, if you missed connecting something back, you might just find it this instance.
Dispose off all the garbage, collect the engine oil in an airtight container to keep it safe.

All done and we are good to go