Try not to worry too much, we have all been there. Reversing is usually the thing that get’s to people the most and as has already been stated if your trailer is in your mirror and you don’t want it there then steer at it but be aware that a trailer needs time to react so push her back and see where she is going then adjust your lock accordingly. Forwards or backwards, you steer the frount of a rigid and the back of an artic.
Good Luck!