I have too much carpal tunnel and arthritis in my hands to hold the thin steel Appliquick. In case there are others out there with similar problems, I am sharing my solution.
I use a watercolor/acrylic artist brush with an aquarelle handle. It is bevelled, rounded on one side and flat on the other. It is intended for burnishing, etc. I use it just like the Appliquick tool, but it is bigger and easier for me to handle than a thin steel rod would be. I turn the applique edge with the rounded end, and then press it with the flat side (similar to burnishing.)
I found that I could use a pair of tweezers to hold the applique in place. This is an old pair of tweezers that do a terrible job of tweezing eyebrows, but work just great for this. I hold them with sharp points down on the fabric. I use my index finger to keep them stable. (see photo).
When finished, I can pick up the applique piece with the tweezers without getting my hands all covered with sticky glue.
One advantage of using this brush is that if the glue gets dry too fast, then I can moisten it - just a tad - with the damp tip of the brush, and the glue is workable again. Washable glue washes right out of the synthetic taklon bristles. (I would never try this with an expensive sable brush.)
My brush is a Winsor and Newton 995 series, although other manufacturer's make them with aquarelle handles also.
I hope this helps someone else.