Changing Ringtones For Messages

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I'm just trying to get started with Tasker. I've accomplished a few small things: Silent when face down, starting wi-fi when I'm at home and turning it off when I leave, and an profile (with help from a tutorial) that allows my girlfriend to send a text to my phone that turns off silent mode in an emergency. However, I'd like to have it change the notification sound at night ONLY for text messages and then change it back in the morning. I don't want to adjust the volume or make it silent. I want to completely change the sound file. I just want to know if it seems like something that can be done (by someone with limited experience).