I have a large Topiary at my home and I need to graft a limb into an open spot where one of the large branches died off leaving a very large hole. I learned to do this 30 years ago from a plant farmer I worked for as a kid but I was 8 then and only did maybe 4 or 5 citrus trees.

I'm kinda in that area where I remember but I don't remember and would like to relearn how it's done before I do this. There are 3 possible limbs on this tree that I can cut and remove without deforming the existing form so I figure I have at least 2 chances to get it right. The first try would be wonderful.

Is there a website, Youtube video direction, Books I should search for that are recommended?

Thank you.

John