For this I’ve taken the payment amount of the second loan and included it as an additional monthly expense.

Additionally, trying to spot paint even a white wall with white paint doesn't work, let alone other colors.

Here in FL a pool trumps all and having a spa feature built in offers additional ROI. 

Given that you're not married, that adds some additional complexity.  

However, if gaining expertise in these areas is essential for long-term success, I’m open to learning.I appreciate any insights you can share.

You can assume about 1% in closing costs in addition to commissions so you're starting around 7% before the seller gets any cash at closing. 

Additionally, the supply of homes for sale is constrained because of this and will be for some time putting upward pressure on prices in most markets.Thinking about renting your house in Seattle would be wise as someone else will pay the mortgage down, and rents and the value of the property will go up over time.

The family viewed the house, loved it, and requested that I install satellite TV and add it to the costs, which I did.

However, you have the additional question about if and how you might enforce a judgement in another country. 

I track the principal as a Liability account in Xero, and whenever I add it to a report, it always shows the current balance, rather than the change over the chosen time period (like with expense accounts).