It can be very difficult to figure out what to charge, and it is always a changing number too as you go along. Keep in mind, it is often much harder to raise prices vs lowering prices. So if you are tempted to start out by charging very low to get your initial customers, it can be a tough sell when you start to raise your rates as you dial in what you need to be charging to account for all your expenses and profit. One thing I would recommend that can make it a bit easier, is to try to niche down a bit and target one specific thing. Maybe it is swapping out water heaters, snaking drains, new construction, etc. Getting really good at a niche helps you get really efficient at that task, opens opportunities for cost savings on common supplies/materials, and allows you to be a master at that job so you know you won't lose money on a job. Best of luck on this journey!