cgr, it is automatic, however there is a huge difference between someone experienced doing this and someone that has their hands full dealing with a slow steady trainer that is already trimmed out.
You don't always know that a plane is grossly out of trim until after the wheels leave the ground, right after takeoff low speed, high angle of attack, low alt. all means there is only one shot to get it right.
Nothing hard about it, but nothing forgiving about it either.