Same experience here - easy with the small balloon, somehow it's not so easy with the big and beautiful balloon.
Just try to relax. Remember - it's just a balloon. It's your toy, it's been designed to bring a joy and pleasure for people. Just get yourself on a top of your balloon and try gently put your wight on it. Don't rush - take your time. Feel your beautiful balloon between your legs. Enjoy it.
Whenever you feel safe - keep going. Whenever you are not sure - just stop and relax. Do not rush.
Whenever you are comfortable to sit on your balloon - do it. Your balloon wants you to sit on it. Just be gentle.
Relax and enjoy yourself riding your beautiful balloon. And try not to pop it - because your balloon is so beautiful

Keep that pop for the big climax, when someone must explode - is it you or your balloon. When one of you is ready - you are so ready to sit pop