They're all systems and processes though good at communication.

I think it requires certain level communication skills and rationale (which I dont have).My tenants now are self-employed gardener, and the other is a Doctorate student.

I would strongly recommend you try to discern that first or communicate these concerns you shared with us with him, and give him a timeline.

I have a full time job but am still making sure to keep close communication with everyone.

I even use Skype and TeamViewer to communicate with clients so I'd highly recommend looking for one of the best with great references that interviews well with you.So look for someone you can connect with that works out for your situation.Feel free to ask here if you have questions

However, my analysis was based on the assumption that all my current tenants will for at least a year (which they have communicated to me) .  

We have a seller that has stopped all communication.

You don't need to know programming language, you just need to be able to communicate your needs well.

I agree with @Owen D. that Facebook was not intended for direct communication with strangers to solicit business, but does present a way to communicate.

What this exercise might find is:- Contractors willing to communicate and go through formalities of estimating- How hungry the contractor is for work- Which contractors answer your exercise most professionally - Which contractors go above & beyond with thier answers and their own past example work/portfolio- Which contractors accurately estimate material and/or laborOf course if they don't or won't reply, it could also mean they are too good and busy to jump through your hoops -- so they could be great contractors as well.