Check Strap Fitting Guide
Check straps can be changed in about half an hour each and once you've done one the second will be a breeze. Before you start ensure your windows are closed and that you have the corrected handed replacement parts. You will need a set of Alan Keys a socket Set with a 13 mm and a 10mm socket and a Philips Screwdriver.
If like me you ordered new door handle blanking plates the easiest way to remove the old ones is to twist force a screwdriver into the middle of it and pull it off. That way you'll avoid any damage o the handle itself. With that off unscrew the recessed bolt hidden beneath.
Above this you'll see just behind the door catch another blanking plate with a small notch. remove this but carefully prising it out with a small screwdriver and remove the screw behind.
Moving back to the handle using only your fingers grasp the electric window module and lift this up carefully, it's only push fitted so will come up with a little effort. NOTE, the drivers side is retained by one screw located just under the armrest. this must be removed before attempting to remove the module. With the module free unplug it and place it to one side.
Behind the switch you will see the second handle securing screw, remove this.
Moving back up to the catch remove the tweeter by pulling on the catch and sliding the tweeter past it placing it to one side after pulling out the multi-plug.
Moving to the bottom of the door remove the screws that run all the way along including the screw which retains the puddle light. With this out you can pull off the light which is held on by two catches, one on either side, place this to one side.
Moving back to the top of the door remove the A Pillar cover that holds the electric window multi-plug
Now carefully work the inside of the door-card away from door releasing the poppers as you go. Once complete move the the outer edge of the door and do the same. The door should now be hanging by the top window scraper.
Next push the puddle light through the door thus removing it from the door-card. This is your last connection to the door and the card can now be removed. From a standing position by the outer edge of the door using a secure grip and pulling one side at a time apply upwards pressure until the card is released. The inner edge should follow with a little more pressure.
Once you have the door-card off you new need to remove the door speaker by unscrewing the for crews and removing the multi-plug. This will allow access to the Door Strap for removal.
I would suggest removing the large bolt (13mm I think) from the A Pillar first as this makes access to the two smaller bolts on the door easier. Retain all fixings as Alfa DO NOT supply replacements! With the 13mm bolt removed then remove the two 10mm bolts again retaining for re-use.
Please do note that these straps and handed and as such you must ensure you fit the correct ones to the correct door.
When fitting the new strap I found it easier to attache it to the door and then the frame. Try not to push the strap in as pulling it out again can prove almost impossible. Also avoid over tightening the bolts, I did on one and it snapped meaning I had to refit the old strap and order a warranty replacement.
Refitting is obviously a reversal of removal. I hope this rough guide has helped.