Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

It's your job as a landlord to respond to these things in a professional manner. 

Is this something I should hire a lawyer/other professional for or can I just do it myself? 

It’s worth a look see, just do your homework up front before hiring the other professionals to make this happen.Good luck

I understand that means paying the right professional for their services. 

Your profile mentions that you are an agent with rentals.You would want to see if you are able to claim real estate professional status.If you are able to claim real estate professional status, you can potentially offset the rental losses with your real estate agent income.Furthermore, TN does not have a state income tax allowing you to be more open with your options.Best of luck

Thank you for your professional guidance.Sincerely, 

Work Quality:I hired professionals to inspect the work, and they found multiple issues and evidence of negligence in the construction.

And if they are a hobbyist/part-time builder, then they should engage the proper professionals, i.e. a title officer, civil engineer, architect, contractor et al to assist in reviewing the project's feasibility.

@JerryllYes I completely understand have been a professional data scientist since 2018 before i swapped it out for real estate development 2 years ago.