I have visited Mata Mansa Devi Temple twice. No doubt it is a great pilgrimage spot. To reach this temple, one may take trolley from near Har Ki Pauri or take to stairs constructed on the hill. The ascent by stairs is quite steep and is not advisable to people with heart ailments. The trolley service sometimes gets so overcrowded that you have no option but to try your foot. So do not go on high rush days. The temple naturally remains greatly crowded with the management not doing enough to establish order and calm. Don't go with loaded pockets, as you will be at great risk of losing something valuable. The pilgrimage, no doubt is great.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.