WARNING: IF THE DEVICE YOU’RE ABOUT TO OPEN IS WITHIN WARRANTY OR SIX YEARS OF OWNERSHIP THINK TWICE ABOUT THIS
It can take longer than just paying someone to do it, but it’s far more rewarding + generally much cheaper.
From making a device that warns you when someone has entered your room to fixing your broken mobile phone the possibilities are endless
1) Buy the right tools
2) The guides on how to fix tons of tech
ifixit > http://10ws.co/1GdQH6E > Learn to pull apart gadgets and fix them
instructables > http://10ws.co/1C2HUOu > learn how to build or improve pretty much anything
YouTube > Pretty much everything already covered