I commend your enthusiasm in wanting to have ago.
However it is not easy stripping a laptop down so you can get at the DC jack connection, never mind rebuilding again.
Also not that easy to de-solder re-solder a new jack onto the board without destroying the tracks a lot of practice is needed.
A laptop is an expensive place to start learning.
My advice would be to get it done professionally as you are then covered if they mess it up.