Removing Lino from concrete floor and levelling

[W66OCH]

My old toilet/utility floor is covered with old lino and tile grout on top, so shifting it is fairly challenging is there an easy way?

Also, I need to level up the floor where the room has gone from being two seperate rooms into one, can I use self-levelling compound and is there a maximum depth for this recommended? Ideally I could just self-level over the whole lot and lose a cm or so....