Be worth getting whoever you're getting it from to over it with you. Take a notebook and a camera!

In reality, it isn't that complicated. The mainsail/halyard/mainsheet/traveller is pretty self explanatory if you're familiar with cats. Jib halyard is a bit more complicated if it has the usual Stealth system with a turning block on the forestay and a 2:1 purchase on the front beam. Spinnaker can be confusing until you see what goes where (but everyone gets the sheets the wrong side of the retrieval line at least once!). Enjoy!