Concentrate on using just the right hand gear lever for a while. leave the chain on the small chainring at the front (or the middle ring if its a triple) and just change gears with the right lever.
Try not to think about which gear you are in but rather think about how hard it is to pedal. Change gear to make it harder or easier as required and you'll soon get the hang of it.
If you move the gear lever the wrong way ,no harm done, just move it 2x or 3x times in the opposite direction until the pedaling effort feels comfortable.
good luck
