I taught myself to fly, so I had to teach myself to trim too. I started with small E power planes though. I was also pretty lucky. The best advice I can give is to practice changing the trim tabs on your transmitter, without looking at it. Once you can easily find the trim tabs, you are ready to try it. One more thing, don't get in a hurry. Even if you have to fight the plane a little, get some altitude. I know thats obvious, but on the maiden flight your heart is pounding and the adrenalin is pumping and you tend to rush it a little. I have done about 20 maiden flights now and its the same every time. Gota love it.