Memorize shorter verses initially, then add longer verses. Memorizing the shorter verses will give you confidence to tackle the longer ones. Find someone to whom you can be accountable. Write the verse on a small card you can carry with you. Read and review the verse and reference over and over.
Repetition is the key to learning.
Consider setting the Scripture verse to music. Substitute the biblical words for the words of a song or chorus you know or make up your own tune. Consider purchasing prerecorded Scripture memory verses set to original music. Use the verse whenever you can. Write out the verse once a day for a week.