Practise this sitting in the car with the engine switched off and the clutch pressed down. If you are having difficulty mastering the gears, why not try driving an automatic car. In most vehicles the first 4 gears form an 'H' appearance on the gear lever. Neutral is the middle position in the 'H' formation on the gear stick. To engage reverse gear you sometimes have to either push the gear lever down or lift it up towards you.
Different vehicles have different setups.
So always check were reverse is on a new vehicle. Reverse is often in one of the 3 positions marked in dotted red in the diagram opposite. There may also be a 5th gear. 1st Gear is used for moving off, manoeuvring and for creeping slowly in traffic and at junctions. 2nd Gear is used for moving off down very steep hills, building up speed after moving away and driving at low speeds.