It took me a track day in the wet to figure out that rain riding wasn't as scary as I imagined it to be. Trust your tires and ride smooth.
Proper gear cannot be emphasized enough. Also, having the gear with you is important too.
Nothing is more frustrating that running into rain and realizing that you left some or all of your rain kit at home. Check the weather report in advance and be prepared (or stuff it all in your bags and have it at hand).