Just a couple of observations about caring I've noticed over the years...
1. When you meet someone who really cares about their work, about people and about helping their customers, well, that experience is usually very remarkable. It is infectious and you can't get enough - it keeps you coming back and telling others about your experience. There is almost nothing I can think of that is better for your customers than genuinely caring about them and the work you do. Not a sale price, not a bonus offer, not branding or packaging. Caring about another human and caring about your work is a very difficult thing to compete against. At best, there may be a company that could care as much as you do, but the deck is stacked heavily in your favour as a micro business owner.
On the other hand...
This post has nothing to do with painting in particular. It contains a simple piece of advice that I received from a real good friend who worked with me for a couple of years. I learned a lot from him, and one of the sticky-est principles is this...
If making a good first impression is the most important 5% of a job, finishing is the hardest 5% of a job. The way the job ends will be what is most vividly remembered by your client.
At this point you may be tired, behind schedule, over budget, getting impatient, feeling discouraged, etc. You just want it to end, so you can get on with your life...