1. Put some music on or a podcast to make it fun.
2. throw away all trash; including items you no longer use or haven’t used within the last 18 months. Go through cupboards and fridge and throw away all expired food. Less clutter = easier to clean

-start with one room at a time -for upkeep, I find it easier to do one chore a day rather than saving everything for one day

Best of luck. The biggest hurdle is recognizing the problem