In my opinion it is worth spending the money to hire the professionals both from a liability and headache saving perspective.  

@David ThoenyCongrats on your project.Smart to hire a GC.

We ended up hiring a local GC to finish, and will be using him in future projects, helping us scale and not be restricted only to our market in the long run.

Appraiser hired by my ex’s attorney came in at $205k.

So this year I hired a very expensive CPA.

As many agents are not familiar with 1031 exchanges, I think that hiring a 3rd party expert is definitely the right move. 

As of now I don't think I'm going to hire a property manager since it's just one property so I've been looking into software to streamline the whole process of managing a property.

I decided that I was going to do as much work myself as I could, and that I would also hire my wife's coworker, who had experience remodeling homes, to help facilitate the work that I wouldn't be able to do on my own.

should I just hire attorney and let them know if they don't pay accordingly to the contract, a legal action will be taken against them?

The buyer should hire an inspector (with your direction) that they trust.