I'm pretty sure that the window has to be up(closed) to get the mechanisms out.
So with window up, undo all the lift mechanism screws out.
Note that the glass itself will be able to come out of the channel it sits in. It's held in by a rubber strip .. ie. friction.
Can be hard or really hard depending on age and condition of channel.
The channel itself can be separated from the lift mechanism too. 
haven't done D1(yet .. I know it's day will come) .. done my D2 tho. Pretty much the same.
Also note: the top channel that the window slides up in also does come off the door too. A bit of a PITP(posterior) .. but if absolutely required can come off.
EDIT: note too. leave the connector on the motor till the last thing to do as you pull the mechanism down and out. 
I remember I needed to 'open' the window via the switch .. to close up the scissor mechanism to get it out the door. It was a balance between lowering glass and using the switch to get the mechanism closing up a little wiggle here wiggle there .. etc.
				
			 
			
		 
			
				
			
			
				Arthur.
All these discos are giving me a heart attack!
'99 D1 300Tdi Auto ( now sold :( )
'03 D2 Td5 Auto
'03 D2a Td5 Auto
			
			
		 
	
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