I am going to make the assumption that your intention is to run a legal enterprise and not trying to evade taxes or screw vendors, customers, etc.For most of your questions, the answer is going to be "it depends on what exactly you are going to do."  

The outlets are not grounded.You have "plug" or "Edison base" fuses - the ones that screw in just like a light bulb. 

I'm struggling right now to decide if I should spend more than I want on a ready-to-rent property, or risk getting screwed in the rehab process to buy a very undervalued property and try to rehab it successfully. 

That could screw up your DTI depending on how much your income is.

It keeps your eyes peeled for people trying to screw you lol.

I used to watch guys on the job sight using a screw driver as a hammer.

Then they come back and say "oh, we screwed up, you can't get that much from the seller on a conventional loan, sorry".  

If the Seller's attorney is inept and screwed up any of the very specific, tedious, administrative details required during the 45-day barment period, it's a better than good chance the judge hearing the case won't grant the motion that would pave the path to an insurable title.  

I would assume there is a set screw in the rings around the locks, or the ring is threaded and screwed on, on the inside. 

I don't want to get screwed by a contractor on my first deal.