If you're new to driving at the limit in the wet... there's more grip than you'll expect. Having said that, once you push too hard it will tend to take longer to stop sliding so it's better to go a little slower than you think you need too until you're dialed in. If you want to learn, PSM MUST be off! Take it easy and have fun.
My first racing school was in the wet. I had equipped my car with some worn out, ten year old, Dunlops from behind a friends tire shop. This was back in the days before Dunlop even made 'R' compound tires. They were oversized and into the wear bars- perfect for a DRY track day. Driving there, I was so afraid due to the heavy downpour, that I actually thought 'I might die today'! There was puddles all over the place including at the end of the longest straight! With my instructors help I was soon having a blast! I've never been afraid of wet since.
Ps. it'll be dry that day- trust me- I know.