Stable income: Somewhat stable

Christmas light installation can provide a moderately stable monthly income for individuals. Based on online research and typical experiences, some people earn consistently, while others may experience fluctuations depending on seasonal demand and competition. If your best friend quit their job to do this full-time, it could be seen as a moderate risk. I'd rate it a 3 out of 5 because while there is a decent baseline of income, it may not be as predictable as a traditional job.