Yes, you can do DIY, but it does come at a higher risk of IRS challenge as @Michael Plaks mentions. 

I have over 100 lots to build . utilities in place 800 people on waiting list for section we need houses.i am also a sec 8 landlord 

In her message she states that because she zelles so much, I'd have to 'wait my turn before I get my money.' (????)

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

I would mention to Tenant B that I was visiting Tenant A and smelled what seemed like marijuana smoke coming from their side and remind them there is no smoking permitted inside the house.

As mentioned above this will catch up to you and bite you. 

Last but not least....A few members in replies have already mentioned why it makes sense to hold…….I very much appreciate ALL FEEDBACK, however I think it will be helpful to provide some added context as to why I am absolutely certain (and my CPA’s are convinced as well) on my decision to liquidate the entire portfolio and onceAs I educate clients on daily, income tax brackets as well as long term capital gain tax brackets in our country are more favorable right now than they've been at any point in the past 80 years.

What some people on BP don't seem to understand is to stop making the assumption that everyone is not working their best at thisif you have to provide negative comments or any sort of negativity when providing advice, then advice or recommendations shouldn't be your fortéAs i mentioned before.

My agent also mentioned resources that could be of assistance for that. 

I would not wait for something bad to happen.