Definitely go with the club instructor. Nothing against your cousin but if he's still learning he's may not be a good place to learn. As he's just learning he may not have the skills to recover your plane if it get's into trouble. Most instructors are very good at keeping their students planes out of trouble (knock on wood, I've never let a students plane crash yet) which makes it a lot easier for the student if he has the confidence that the instructor is going to keep his plane from crashing. Go to the club tomorrow and don't be shy. Introduce yourself and I'm pretty sure they'll take you in a heartbeat and start trying to help.

Ken