Here are the seven steps for how to estimate a paint job:

1. Review the plans.
2. Complete painting checklist estimate.
3. Estimate the cost of materials.
4. Estimate cost of labor.
5. Estimate cost of overhead and marketing.
6. Determine your markup.
7. Determine final painting estimate.

You can find more details about each step in this [source](https://1build.com/blog/painting-estimate/).