I need to replace the Drivers side external mirror can anyone please give some hints. I haven't had the car long and I am still finding my way around it

Thanks in Advance

need to remove the plastic sail peice inside, there's three screws located around there (one have to remove the cap on the door trim to access) to undo the mirror then it's a matter of disconecting the plug in the wiring loom, all up not too hard!