MrsSadness Welcome to the Kult! 
We all start from a different point.
I would say, having read, litereally, thousands of posts on here and another Kondo thread, that the majority of OPs, have (what they consider) cluttered homes, which are more or less, clean.
However, there are some people on these threads, who have, what might be described as 'hoarded' homes... I am one of those. Our homes are mostly uncleanable, although I have managed to maintain the essentials - clean bed, clothes, one food-prep surface, pots and pans, and bathroom and loo.
I am not a slattern, and neither are you! We want a clean home, but with so much Stuff, we cannot clean! And, we may have been lazy, in the past, but we are aware that we have a problem. A good starting point! 
Kondoing a stuffed house is a longer job than clearing a cluttered home. So don't kid yourself that it will only take MK's 6 months, especially as you have family and work commitments. It will take as long as it takes, but you can have the home you want. 
Cleaning comes after discarding.
If you start with your clothes, you can clean drawers, wardrobes and shelves, before you put back what you are keeping. As you progress, more spaces become cleanable.
Maintaining these areas, as you continue is easy and quick, so slowly your home will come under control.
As Fly Lady has said - "you can't organise clutter". Dealing with the separate categories, is not just a physical task, it makes you think carefully about the best (most useful) places to keep your possessions.
For the first time in my life (apart from when I worked as a chambermaid, over 50 years ago!) I am now taking pride in keeping my cleared areas clean. So. cleaning can start early and good habits will grow, as we progress.
The MK process, changes our mindset, making us think carefully about what we bring into our homes, and what brings us joy. Having only things in homes that we love, or indirectly bring us joy (like vacuum cleaners, etc) will cut down the huge amount of junk that it weighing us down, physically and mentally.
Start by visualising, generally, how you want your home to look. This is your target. It will be tidy, and a tidy home, is quick and easy to keep clean.
Stop beating yourself up. No one is perfect, but we can be better!
Dive in, and soon, you may be able to change your username, to a happier one! 