Enjoy it! Competition is a rush! Just remember that you are putting your time in now and by the time you are on stage, all you need to do is enjoy it! The one thing I can tell you to try to keep under control is the perpetual roller coaster ride of panic while you are in prep waiting for the weight to come off, etc. Just keep focused & look at the long term because 15 weeks can be really long and really short all at the same time. The thing to knwo is that you will see slow changes up until your last 2-3 weeks -- then you will start seeing *dramatic* changes! It is so exciting to see that.
Just make sure your trainer is reviewing where you are on a very regular basis and making tweaks as you go. He/she can't always predict exactly when things will start happening, but they should be paying attention & adjusting the whole time.
If you start getting frustrated, ask questions, and please know that you can post up HERE ANY TIME! Just if you need to vent or unload or have a panic moment or a victory moment!