ID, I hope you don?t mind me jumping in here.
I use the JzBz and the German grafting tool. I am not good with the Chinese tool so I use what works for me. It?s all a matter of personal preference, I could use any of the three just fine but my personal favorite is the JzBz, a plastic dip stick with a tiny lip on the end. To me, the lip slides right under the larva so easily. Just so you understand they all will work for a fella, not hard to master.
The Chinese grafting tool has a very thin soft flexible lip that a lot of folks like. They are not expensive so buy one of each, jzbz and Chinese, try them out. The German tool is stainless steel and cost as much as the other two combined, but it works.
The trick to grafting larva is to position the frames correctly; slightly tilted, clear visible lighting to the bottom of the cell and magnification is extremely helpful. Add a warm cloth to maintain moisture so the larva does not dry out. There are many YouTube videos on the subject.
If an old fella like me with 20/30 vision with hand tremor can accomplish grafting then most everybody would find it a piece of cake.
Blessings