Not finishing what they start

How do I get the older kids to finish things they start? To not half azzz things.
I have fought this problem on several fronts and am now just to the point that it frustrates the hell out of me. It angers me.

The lawn, never gets fully finished, small projects, again never finished. Cleaning, laundry... there is a list of things. I just want them to finish what they start.

In a week, a friend of mine from high school is flying in for a visit. She will be here for a week and then we are driving back for our class reunion. I want to make sure the house is ready for a guest. Trying to get some of the little things around the house done. I don't think that is too much to ask. I have a few things I need to get done. Projects I have been putting off.

I have gotten a few things done. Put flooring down in our closets and am almost finished with the flooring in the bathroom. Only one spot left and that is because I have to cut more hardy backboard and it has rained, so I cannot go outside to cut it. I also need to finish the small closet in the front of the house so we can begin using it. I am finishing the floor and putting in shelves.

I just need to head to Lowes tomorrow.