Many CxO's have same problems. IT is hard to plan. Budgets are moving targets. I know this thread is about the opposite, but this is where I'd recommend someone

Many CxO's have same problems. IT is hard to plan. Budgets are moving targets. I know this thread is about the opposite, but this is where I'd recommend someone at your level not try to become an expert budgeter. Find/hire a partner who is even if it's just on a CFO advisory level (can be a more junior person if it's just budgeting, planning, etc; CFO level if more strategic). Managing people is more of a craft. Approach it the way you would learn to build furniture as a hobby. Gradually over time through practice and experimentation acquiring tools for your shop along the way.