On many laptops you can change the WiFi card. On some you can't because of
digital restrictions or because the original WiFi is non-typical. What I
would do is try and see if it works.
I've changed the WiFi of 4 different laptops and it worked for all of them. I
buy WiFi cards from computer repair shops, because they always have second
hand WiFi cards. For two of the laptops, I went with them to the repair shop.
I disassembled the laptop there and tried their second hand WiFi cards before
buying. I also gave them the original WiFi, so they sold me the new WiFi very
cheap for around $3.
About the disassembling. You don't need a book, if there are even such books.
It's not that complicated. Usually, all you need is a small Phillips screw
driver.[1]
https://en.wikipedia.org/wiki/List_of_screw_drives#Phillips
Then unplug your laptop from any electricity, remove the battery and start
unscrewing screws, usually starting from the bottom of the laptop. Remember
where the unscrewed screws were from, since there may be many of them! :) I
have a way of organizing the screws so I can remember where they were from.
Different laptops are disassembled in different ways. Watch some videos of
people disassembling laptops. There may be even disassembling videos of your
laptop model. Sometimes you can find an official disassembling guide for you
laptop.
If you are worried about breaking you laptop, try disassembling a cheaper or
non-working laptop. It is possible to break you laptop, if you're not
careful. :)
Also, if you want try a WiFi card in a shop like me, make sure you can
disassemble and test the new WiFi fast, so you don't waste people's time and
get in the way. Figure out how to disassemble the laptop at home, before
going to the shop. :)
