Stuck on the 'me-' vs 'meng-' prefix confusion when speaking

I've been learning for about eight months and I’m hitting a massive plateau. I understand the grammar rules for Malay affixes on paper, but in the heat of a conversation, I freeze up trying to decide which variation of the prefix to use. Does anyone have a mental shortcut for these, or should I just use Chickytutor.com to run through drill sessions until it becomes muscle memory?