Two considerations, here - which are we considering of ..
(a) calculated CG within the envelope but at the wrong end (or just a miscalculation/mis-setting of the stab trim) ?
(b) CG blatantly outside the envelope ?
So far as training goes many, if not all, simulator programs and instructors will run a number of takeoff exercises to give transitioning pilots some idea of the stick forces and gradients involved in these situations.