Oh, definitely need any assistance possible. Thanks
The leatherback video is good, except for the good man CUTTING TOWARDS HIS FINGERS!
Do not do that. Sure, it's easy and fast and it goes right 90% of the times. The time it doesn't, you're going to hit bone because it's always sharper than you think. If you need help not cutting towards your own hand, hold a knife in one hand, and use the other hand to push it. This way they're both occupied and can't accidentally grab the trunk. I've been playing with knives, scalpels, box cutters, chisels, and other sharp tools for 30 years now and honestly, I need to remind myself every single time I try a new operation.
In addition to the video, I recommend using some alu wire or some zip ties on the ring cut to prevent the cut from healing over; in especially small material that's growing vigorous, it will bridge in a couple weeks.
Wood lice are an issue here, they eat away most of my callus tissue just before the roots develop. So treating the sphagnum moss with some kind of detergent, permethrin for instance, might be useful.
Start your air layers just after the leaves have flushed out, this is faster than when you start them earlier or later. I think it has to do with the immediate hormonal and wound-healing response you get in an active season, as opposed to delayed responses outside of it. That is, for most broadleaf. Prunus species seem to do better when layered just after flowering.