Although they need volume due to the sunk royalty cost.PM Only: Their business is only management oriented, therefore they can apply all of their efforts into the same tasks and systems.

The greater the 'wound" the greater the anti-bodies. 

Individual vendors for plumbing, electrical, appliance repair, and general carpentry can be easier to work with if you make it easy for them, meaning, don't always try to get the price down; don't make changes unless based on new info they provide you early into a repair/project; don't have multiple people giving them direction; pay them promptly, net 15 if possible; don't waste their time requiring constant written estimates for small or routine tasks.

This way if the work starts off looking bad you still have time to bring in someone else if the contractor isn't up to the task.  

, but you can mark as completed once the task is done, and you would need to manually reach out via phone or text to coordinate.  

Learning real estate can be a long task or short task depending on the time you have.

@Kevin Miller I have a book of subs that I used for different tasks.

You can't get started without submitting an offer and that simple task alone is a great learning experience. 

@Juan T. Ask

All these tasks are easily automated or cheaply done.Smart DIYers value their time and don't have these problems you mention.