Hi Sara
One of the best tips I can give you is to make sure you put your JY luggage label on your case AND your hand luggage. It makes it easier for the agent to spot you at the airport and offer help and for fellow travellers to spot you too. Look out for others with a JY label and say hello, don't be shy.
The first solo trip is a bit daunting but once you've done it you'll have a great sense of achievement and will soon be looking to book another!
Have fun!
Rose