You hire people do this.

Don’t want all of my insurance policies to go up or deal with the hassle due to this neighbors negligence.Worth hiring a lawyer to send a demand letter?

I've had to hire Real Estate brokers and Professional Engineers (PEs) as "expert witnesses" for defending various false claims.Regarding #3, the smaller your project, the less likely you'll see high impact study costs.

You can’t swing a hammer you have to hire somebody to swing the hammer.  

What your goals are for any purchase are very important.You sound like you may have just hired anyone as your agent.

If you can't get the residents out that are not paying, then nothing will help.I would hire an attorney that deals strictly with evictions and start issuing eviction notices to anyone who has broken the laws of their lease.

The expense of making an error or hiring the wrong contractor can very quickly be much greater than just hiring a PM. 

I was doing small quantities of about 2,000 a week.I decided to go with in-house (I hired someone) to see if sampling made a difference.

When the time comes to evict our first tenant, I will hire the best lawyer and let the expert take care of it.  

I built some new construction up in Ocala area and it was uber frustrating as well getting permits my GC I hired though finished the projects although it took way longer ( not his fault) So for us it was not a great investment we made a little return but nothing that was commiserate with the risk.I think this is an issue with FLA  with the uber growth going on  etc.