GryffinSong...we discussed this quite a bit early on and there are no hard and fast rules...I originally thought to pick a deck for the whole 52 week study but realize that might not be realistic....I even have trouble with long term committments..LOL
We sort of decided we would try not to change decks EVERY week....part of the nature of the exercises are to build a deeper connect with the deck and if you switch too often that might affect progress. Some people may change once a month. I personally am going to try to not switch except once every three months...once a quarter so to speak....If I can keep with the same deck longer I will.
It is your choice but some activities do build on each other....like the element ones so keep that in mind.
Glad to have you with us. I have certainly been building a deeper connection with the fae. I am using my favorite deck....the original Fourd's Faeries Oracle.