No balls were hit to Parra in Monday's contest as his small bit of action included catching a few throws from infielders.
"He looks comfortable," Brewers manager Ron Roenicke said. "He received balls well, so I think that's good."
However, Parra did have to hold a couple runners on and was able to get a feel for the position.
"A little bit different, but it's nothing big," Parra said. "Just play fun, play happy."
Parra, a Gold Glove outfielder, is not moving to first base full time and is simply there to provide depth and give Roenicke some options.
"My mind is [to] play outfield," Parra said. "Sometimes, if I'm needed to play first base, I want to play."
The Brewers traded for first baseman Adam Lind in the offseason, but Lind has had back problems throughout his career.
Parra, currently listed as the team's fourth outfielder behind starters Khris Davis, Carlos Gomez and Ryan Braun, is not sure if he will get any more game reps at first base this spring, but if called upon he's happy to contribute.
"The point is everything good for the team," Parra said. "If we need me to play there to win, I'll play there."
Playing the infield is obviously a lot different than the outfield, but Roenicke believes Parra will handle it just fine.
"He does it so much," Roenicke said. "I'm sure he feels pretty comfortable there."
In addition to Parra, Jonathan Lucroy will also get some looks at first base over the final two weeks of spring training.