lol. If you made it through the hills with a stick, then you'll be fine.
Regarding the bills, I recommend asking your brother in law if they can just be under his name (since every utility requires a RUT #) and you can handle the payments online. That way you don't impose too much. I pay all my bills online down here and they can be paid with a local acct or a credit card. There is a small fee to use an international card on most of the sites, but it's not that bad, I think about 3-4%.
If you ever have issues with the functionality of a local site (in Chile), you may want to install a VPN. This allows you to connect as if you were in Chile. I sometimes have to use one to get access to some sites in the US. Or to get more options on Netflix 😉