Unlike some dance cultures (e.g. Scottish, Irish Sets) you shouldn't be expected to memorise sequences. Once the building blocks are learnt the individual dances are walked through each time, and the caller is there to prompt until everyone has 'got it'. And you only need to keep that sequence in mind for a few minutes, next time another walkthrough.

Where I come to grief sometimes is because American Contras are now danced for ages (used to be 7 times through when it had to fit on a record), I'm all right before the caller stops calling, and just after, then I lose concentration and start getting it confused with the previous dance.