The barrier to entry for these types of services is pretty low, and after a relatively modest investment in some equipment, you would be ready to go. This type of work is something that can be done on evenings and weekends. The key is hustling to earn business initially, and lining up as much business as you can in a neighborhood to conserve travel time and prevent inefficiency. Snow plowing is another decent side hustle if you have a 4WD vehicle or UTV. Swimming pool maintenance is another good option.