Hi, I've done this but didn't take photos (I know, sorry I can't believe I didn't make notes or take photos)

. It is a fiddle and there is a knack. First thing get the back plate and clips clean, there's not much clearance on these. One of the clips has little lugs on the end, before you remove them check where these are so you can get them back the same. Prize the one clip over these as you pull the other one out. Make sure when you replace them the lugs lock over. The clips are bent to form a spring, take note which way they are as you take them off.
I thought I'd found something on the net about these but I've been looking again and can't find it.
Good luck