Question: Do you ever use parts of the deck only or an incomplete deck?
For a reading, no. For studying, yes, I do look at groups of related cards such as a suit or all 7’s.
On this subject, I have heard of Tarot practitioners who offer to omit certain cards if their clients would prefer it. I haven’t had that situation arise, but I have had people say they were scared of what a Tarot reading would say. If a querent comes to a reading but seems unprepared for what the Thoth Tarot could say and show, I would disclose five particular possibilities to them (death, lust, the devil, a phallus, and breasts) and offer to put those cards face-down if they occur, and ask the Tarot for another similar message in its place. I feel that this would work because I have seen that the Tarot can say similar things various ways. I also feel that my Tarot deck would work cooperatively with me. I’ve built a relationship with it for 28 years.