help broken trackpad screw and keyboard.

i'm in big trouble basically my computer keyboard and trackpad have basically shut down. while i can still use the trackpad to move the cursor i can no long do any clicks. i have to use an external mouse and the right click stops working on the external mouse if i try to click on the original track pad then i need to shut down. The keyboard no longer works many of the keys do not work anymore and the ones that do work are no in the right order so i cannot use the power button at all i have to open the computer and remove the battery which is highly dangerous.

HOW IT HAPPENED

The trackpad on my MBA had gotten worn out it still clicked fair enough but but it did this thing where it would frequently click for no reason or from a slight touch and hold like i'm holding the mouse button . i went online and this idiot told me to open the lap top take out the batter and then tighten the main screw without warning me that if i tightened it too much it would become completely unable to click.

.

Panicking, i then tried to loosen the screw by trying to dismantle the track pad. So following another youtube video i took the ribbons out and tried to unhinged the black screw securing the trackpad however the black screw would not budge so i gave up and began reassembling. However i had a big trouble putting back the big ribbon of the the connected to the track pad i think this is the reason the keyboard stopped working.

Oh my good please help me, this computer has a big sentimental value to me i've had it since the end of 2012 it means a lot to me. i just don't know what to do.