lucretiab, most of the people who thought they didn't need the MK Bible, did buy it. It's a short easy read and motivating.
If you want to start without it, start with your clothes, only keeping the items that fill you with joy to actually wear! Check the way MK folds on YouTube - this is key and uses the height of drawers /shelves/boxes Which is usually wasted. Save containers - shoe boxes and smaller punnts etc for corraling smaller items, as you go. If time is short, break the category into sub-categories.
Then you can do DC's clothes, with their decision-making, if they are old enough. If you have an OH, he/she may like you to show/help them do theirs, otherwise, wait for their Konversion. 
Lots of tips in the first few threads.
Good luck! 
MadauntofA The key to folding any clothes, is to lay the garment out, vertically flat and smooth it. Then fold it, smoothing as you go, so that it is generally rectangular, length-wise. Next fold in half, bottom to top, and then again, until it is just short of the drawer-top. Sometimes it is easier to fold bottom upwards to the middle, and then over again. File in drawers etc with folded edge uppermost.
Things that are too delicate/slippery to fold can be hung, or folded once or twice, and rolled. Ideally, they are then corraled in a box etc, as cylinders, if possible.