If everything you've been doing seems super easy and no trouble then you sound ready to move up!
You unfortunately can't avoid nerves altogether, what I recommend is trying to not think about the "what ifs", because there's lots of things you can't control. Instead, focus on the things you *can* control, and what you CAN do. Think about what you need to do, starting with being organized and ready for everything schedule wise. Then think specifically how you need to ride for dressage, position, hands, bend here or there, etc. Then for stadium think about how you will sit on your horse, riding positively, quietly and supporting. How you are going to ride to each fence on course. How you are going to get that nice forward but bouncy canter. Then for cross country, think about each fences your approach, the lines, etc, what you are going to do if he's a little looky at something. Instead of thinking "Oh my god, that is a scary fence! What if we have a stop there??", instead go "This fence might be tricky because of A, so I am going to do X, Y and Z on the approach to reduce the chance of a stop or runout." That will reinforce that you acknowledge problems that arise, but will also reinforce that you are confident and know to prevent and deal with them.
It sounds like you are prepared for the move up if everything seems easy, nerves and some worrying is perfect normal, so acknowledge your worries, and then immediately think about what you are going to do about it. For example, Dobbin might have a look at the ditch, but I'm going to ride positively with my shoulders back, head up, and legs on, and make sure I have a good bouncy (not fast) canter, so even if he takes a look and a few stutter steps, I'm ready for it. Concentrate on what you CAN do and think positive:)
Good luck!! I hope this helps:)
Last edited by albertaeventer; 06-07-2013 at 02:37 PM.