As a total newbie (glider) myself, I can relate. The guys advice here helped a lot.

First, pay attention to aeajr's comment regarding launch tension. While I followed my hi-start's instructions, my launches were woefully underperforming. Once I got a scale and used it to find the tension 4X of my model's weight, my launches got MUCH higher.

Second - as a power (glow) pilot - I was used to moving the sticks around much more than I should have. I was trying to turn, etc as soon as I got off the line - before I'd built up any speed - and quickly lost altitude. Sailplanes stall pretty easy don't they??

So I made a habit of not touching the sticks (or maybe just barely) until the plane had a chance to settle. then I just tried to follow it, and send it over to where I thought there was some lift.

Oh, and check the CG of your plane! With a GENTLE toss from about shoulder height, my plane (a two meter rudder/elevator only) will go about 120 - 150 straight and level in dead morning air. No stalling, diving, etc.

Hope this helps.

Best... Roger Parrett