The door card removal for front and rear are very similar and you can follow the steps for the rear and use them as a guide to the front.
2006 to 2009 appears a few posts below this one for the Citroen C3 2002-2005 door card.
The handle is in two halves, they just pop apart with a small flat bladed screwdriver.
With the cover removed, two T30 Torx screws are revealed, use a T30 Torx drive to remove them.
The handle stays attached to the door panel.
The window winder handle pulls off. Don't pull the winding knob.
The panel is now held on by plastic clips around the edges and hooked in a lip on the top edge.
Unpop the clips (prepare to break a few) and lift the panel upward to remove it.
Get some door clips (here) in advance to make the refitting more successful.
The 2006 - 2009 is very similar and some pointer are in this post citroen-c3-questions/strong-7-yr-old-so ... -t158.html
The rear door handle is held on by a small torx screw

The door card is clipped on with those white plastic clips shown above, and hooked at the top as seen in the photo below.