it always helped me (back at the beginning of my career) to write everything out by hand - write all of your cue lines and then your character's responses - something about the act of writing with your own hand helps to transfer the information to your brain faster.
I also used to tape record all my cue lines and leave spaces for my character to respond on the tape - that way I had a "scene partner" to rehearse with whenever I needed one.
The motivation and meaning behind the lines is great, but I got overwhelmed when I did that at first. So to JUST MEMORIZE my lines, I used a small, handheld tape recorder. I tape recorded the entire scene that I was in. I spoke the lines of the other actors and I left blank spaces for my lines. That way, when I played the dialogue back, I knew that my line was supposed to come. I did this one scene at a time, one act at a time.
I was able to acutally visualize where I was in the script due to the combination of hearing my dialogue and seeing it in print. Before I knew it, I was off book!
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