This might generic but I find searching or coming up sentences that have words or letters that I struggle on and just read them out loud. I find just searching up a list of words that has letters that I struggle doesn’t really help that much as reading sentences out loud. That way I’m not too intimidated on those struggle words and my whole breath is naturally on the whole sentence that has my struggle word, not my whole breath is focused on that one struggle word only which sometimes causes me to stutter. Sorry that this sound confusing!