Fort Custer Last Stand Xterra

Sunday is my first triathlon of the year. Small one with only .5 mile swim, 14 mile bike and 4 mile trail run. My main concern is the swim because I've slacked off this week on my swimming. Also, I've yet to swim in open water since it's been so cold. I'm sure it will go okay but won't be pretty. I really just do these events for fun so there is no real pressure on me.