How important is self-belief for new entrepreneurs, and how can they avoid the pitfalls of being either too meek or overly arrogant?

Today at a pizzeria, my server ignored me for 2 minutes to socialize with her colleagues, so I left her no tip. Does anyone else feel that welfare benefits like SNAP are too generous, and people are not afraid of getting fired, making others suffer?
How do you deal with the pressure of making every visit perfect when you finally meet your long-distance partner?