Attorney??

How important is it to have an attorney if a child custody case goes to trial?

Our initial divorce & parenting plan was all done without any lawyers because it was amicable & everything was agreed upon. There were no assets to be split & no child support on either side. Now, things have changed & I’ve filed a major parenting plan modification, had him served, he filed his response, & I even tried to set up mediation (he refused). So now the only other thing to do is file a note for trial. I don’t know if he has a lawyer (he doesn’t work, but his gf’s dad has money), so I don’t know if I would be okay showing up without one or not. Any advice??