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I recall having "some" use of my fingers with the thumb being isolated in a splint. It's like the tips of your fingers are exposed and can be used for balance and support functions, but no weight or force can be applied to them. I like @lioness suggestion with pre-loading syringes.
I would have gone to Mayo if I could do it over. The brand of the implant I received from a non-Mayo clinic was called Stablyx and it is only the "ball" of your thumb joint's ball and socket type mating. The "socket" part is just surgically redefined trapezium to accept the ball of the implant, but get this, there's still no cartilage on your trapezium socket, just raw bone. Other prosthetic implants have a two-part system, which makes more sense. I don't know how stable those would be or how long they would last.
Now to your question… If you plan ahead with clothes (sweat pants, etc), meal preparation, bathing tools like an extended back brush you could do this alone if you do one thumb at a time. I had three months between thumb procedures. It hurts. No doubt about it. Stay up on meds. I had a pain pump and nerve block for the first 4 days. All in all, it was worth it. My thumbs were gone. They still have pain associated with overuse but at least I can use them again. Let me know if I can answer anything else I may have overlooked.