1) Try to stay positive and thankful I have the time, if not then I leave because I generally regret it later.
2) Keep focused on the end result and how it will make someone happy, if not I'll get bored and abandon yet another project.
3) Try to stop worrying about what a friggin' mess it is, kick some things out of the way and go while I'm in the mood.
My little woodshop downstairs is pretty much a disaster and some might say I'm a pig and quite possibly a hoarder. Hell, I looked for a palm sander yesterday for 2-3 hours because my favorite one has a worn out pad, went to town to see if it was at that house, went to the company shop and didn't find it, went to my shop at the ranch, looked in two rooms I use for storage, THEN I find it on the foot stool in the living room where 4-5 boxes of assorted tools live.
I go back downstairs and wouldn't you know it, the friggin' pad on that one is wore out also! For lack of anything better to use, I cut some scotchbrite pads to use for pads on it only to find out that was going to be a disaster. I said to hell with it and went and bought another new sander.
It's a tough life I tell you.