Place the results in today , rather than the future. Affirm only the desired result, without placing any hidden reference to undesired things. Affirm what you want, rather than what you want to get rid of. Use the first person, and include your full name in every affirmation sentence. Practice only one or two affirmations at a time, giving them time to work on the subconscious before moving on to other affirmations.
Affirmations are like planting seeds.
Nourish them with continued energy everyday. Give them time to work, and sprout results. Be open to creative ways that affirmations manifest results. Affirmations are practiced by repetition, and are done everyday. Repetition produces results, excuses don't.