Well, obviously on the net everyone will tell you to don’t do it yourself… personally I do change all my outlets, switches, chandeliers, thermostats, etc myself. I moved outlets too, extending them you need an accessible junction box, right wires gauge, romex 12/2, blabla, etc. shorting wires? well, disconnect the wires, move the outlet at the correct place, cut the wires and reput them (with the whatever way it is done in your country).

Having a EE degree and an electrician BIL you should be able to handle this. Best way, ask him to come and let him guide you on the howto.