Hi Trish
Your tour manager or airport rep should be at check-in when it opens around three hours before departures. Don't worry about the check-in - it's all very straightforward, especially with the Just You person there to help you.
If you look for your flight on the departure boards, you will see which check-in zone to head for.
I agree with you about getting there early - it's always a good idea!
Kind regards,
Olly, your editor