I'm assuming that it is on you're mini K and that they are the earlier handles and not the later clubman style?
They are a bugger to get out,
I'd take the 1/4 window and window out first,
As Bill B said take off the chrome trims and seals, remove two larger screws under the 1/4 window pillar and 4 small screws around the door edge.
Wind the window down then pull the 1/4 window twisting it back towards the centre of the door, pull it towards the inside of the door as you slide it up and out the top. You can then windup the window holding it and withdraw the windup window.
There's a screw behind a chrome cap on the inside of the door, take it out and you can remove a square pin that engages with the metal U that goes around the window.
On the other side there's a C clip that locks the other side of that U on to the square rod that comes out of the outside part of the door handle, take it off, there's a clock spring, and washer that comes off, don't lose them down the door as they aren't easy to get back.
There's now 3 phillips screws holding the outside door handle on but no way to get a screwdriver on anyof them, I found a phillips driver bit in a 1/4 inch ring spanner to getto and turn the screws s l o w l y it's a tedious job...
BTW the dumbest reason to take the door apart? The door's not opening using the outside handle? after taking it out I discovered the reason.... it was locked!
So I unlocked it and put it all back together again