Property Managers come in all shapes and sizes, I tend to recommend seeking a medium size local company. 

All of Bernie Madoff's clients thought their accounts were in great shape until the day the news broke.

If so, as @Brandon Weis mentioned, they come in all "shapes & sizes".You'll get more assistance if you post an example here and ask more specific questions about it:)

Bump up the price to market price or maybe a few % above if the house looks good and is in good shape.

What if you had 5-8 paid off rental properties in great shape in great locations? 

I started out researching my market by cycling the city and getting in shape.

Nice new homes are going to run more to keep in great shape..

What's the one investment strategy you wish you'd known when you first started in real estate, and how has it shaped your journey?

This heloc does not, in any way shape or form, affect my wife's DTI.

Experience is another thing - it shapes and challenges the knowledge you acquired and you always find yourself wanting of knowledge because each day is a new day with different challenges and demands as is each deal.