whats the technique needed to remove the original HU with the clasps?

they just seem to slip in then out with me. do i need to squeeze them together? or pull up? etc

next is further down and how do i remove the ashtray unit from the console?

and lastly, the base plate where the heated seats switches are - how can i remove that? (wana make a big hole in it )

ive had a look on the How2's but couldnt find em
(mk4)