I don't recall the exact cost because it was part of a scope of work that included $50k of work, but in terms of labor and material costs dedicated to this exact task it wasn't too much.

Can you recommend any introductory tutorial materials? 

My thinking is if it is that old the home will sell better with modern materials and features. 

Excellent resource material if you are determined to spend the time and effort doing it yourself. 

I've never made a youtube video before, but I want to start trying to get some material out...

This is the only material I used to study.

I also don't want the current PM making up flimsy reasons to retain another cent from the tenant deposit before returning to me under some guise as additional cost to evict.

Can't you come up with any new material? 

If you are not retaining the services of the property management firm, I would insist the funds be transferred to you as an adjustment at Close (your attorney should be able to make this happen).  

This led to the discovery of asbestos materials in the ceiling, and thus, I had to hire an asbestos abatement contractor.