Here's a fast tip.... Lock rear break(don't let go)...place your self alongside a wall, a short distance from it (10-20cm) be ready to lean sideway up agains the wall(let shoulder/handelbar lean against it...). Find your balance without touching the wall, and start leaning back til your front wheel leaves the ground...to find the actual balance point lean against the wall... Spend 5-10 min to find it, and the try it rolling...good luck, and hope I made sense..