Better u send to workshop bro, if u make a simple mistake u have to remove the hole door panel...
If u're good enough there's a trick to replace it without remove the door handle. It only requires a long 2" philip head screw driver, 1 ( not sure size 10 mm / 12 mm ) allen key, 1 bright enough torch light and good skill in hole digging.
The hole is locate at the side of the door.