Using the metal spudger disconnect the frame around the hinges.
It is easiest to disconnect the frame around one hinge and then use your hand to pull the rest of the frame off. You will hear some snaps as the tabs disconnect, this is normal.
This next step will likely cause some of the tabs, that hold the display, to snap. They will still function and hold the display in place and there should be no noticeable issues once put back together, but the tabs will have permanent damage and repeated disassembly will most likely require replacement.
Using the metal spudger pry open the frame around the display.
It is easiest to start at the bottom left hand corner and work your way around. Once you have enough of the frame released you can use your hands to finish the rest.
Its really good work and Professional one. You can also expect the same from Ncentric systems which are offering the Computer and Laptop Repairing in Hyderabad
Seems a bit rude of them to make you take out the battery and hard drive in order to get to the fans; I tried to open mine up to dust off the inside, but I dont have a Torx screwdriver on me. Looks like I'll have to come back when I have one