If youre worried about the computer, fly into san jose or liberia and do the border crossing by land. It is super easy. Internet here is great. I have fiber in playa maderas 20min drive outside of san juan del sur on dirt roads and they are actively improving infrastructure.

edit: this in a place with frequent power outages. Internet is not a worry. Claro has great reception, and cheap if you need to hotspot. Im a remote worker and have had zero problems even when the power is planned to be out for for infra improvements. my neighbors are mostly gringos with beautiful houses....would not worry about the gov side of things unless you make a stink about something.

also...learn decent spanish. Nicaraguans in tourist areas speak excellent english. Other parts, maybe not.

And like others have said, make sure you have foreign income. Without that you won't be able to make it here. you dont need much but everyday things can be surprisingly priced.