I've done this once before - it's intense, but powerful. The 54-day novena is 54 days of the Rosary for a particular Intention. There are additional prayers that can be offered - I've seen them provided but I have to admit - I didn't stick with them diligently, since most of my rosary-praying is in the car (there's a reason for that, chaps).
The first 27 days - we offer up our Intention to God and Our Lady - I found it helpful to be very specific with what I was looking for.
The second 27 days - we thank God for hearing and answering our prayers.
It's not a magic trick - it's an intensive school of deliberately putting ourselves and our Intentions before God. I haven't thought of this devotion in MONTHS - then found it coming to my consciousness earlier today. Feels like a Prompting -
Starting today. I'll finish on August 15 - the Feast of the Assumption of the Blessed Virgin Mary.