I've already given my first loan. I regret taking the collateral that I did, but it's something to learn from and it wasn't exactly a huge loan. The account should be sellable for the amount I loaned him, but only time will tell. He'll probably pay me back, but I'm not worried if he doesn't.
The thing to avoid while lending bitcoin taking forum account as collateral is you must not lend amount equal to account value
So for example, according to you if the value of an account is 0.1 btc in the market then don't give lender loan of more than 0.07 btc
In this way even if the market drops you won't make loss
I found this way when I was scammed by giving out large amount which was a bit high than account value and then later faced loss