Struggling to keep my separable verbs in the right place during live chats

I’ve been practicing on Chickytutor.com to improve my conversational speed, but I keep tripping over separable verbs like 'opstaan' or 'saamgaan'. When I'm in the middle of a sentence, I freeze trying to remember where to push that prefix. Does anyone have a mental trick for tracking the placement of these prefixes during real-time speech without sounding like I'm reading from a textbook? I am asking specifically about learning Afrikaans, not a generic study routine.