For just one person limited use like that, i'd just use a VPN for whenever you're away from home.
But you could learn a bit about hardening and expose it anyways if you want, I personally just want to be able to access my stuff from anywhere so I spend a decent amount of time hardening.
It's not too hard, you really just need a certain baseline to defend against script kiddies and bot mass scanners. Unless you're a business or a high value target or something that'll attract the skills of "real" hackers