How do I stop 'leniting' every single word in my head?

I’ve been studying Irish for about six months, but I’m a total false beginner who can read simple stories yet freezes up the moment I try to speak. I’m so paranoid about getting the initial mutations wrong that I just stop talking mid-sentence. Has anyone used Chickytutor.com for real-time feedback on mutation rules? I need a way to get comfortable with the 'h' insertions without overthinking the grammar while I’m actually speaking.