Hi Gonzo , you can do it.
I started watching you tube videos on how to graft for a full week last summer.
I then bought parafilm & buddy tape ( from Amazon) some stretchy rubber bands #117 , $1.00 plastic boxcutter type thingy from the .99c store with extra packs of disposable blades 6-8 in a pack from the .99c store.
I only do cleft grafts which now i get at least 90-95% success. I practiced all summer on my neighbors huge citrus trees and now love doing it and so will you.
I have to admit i cut my thumbs a few times in the beginning ( price to pay for learning a new skill) , but it was worth it. Now i can graft guavas, mangoes, citrus or whatever with no problem.
A few tips
Always make sure you use a sharp cutting tool.
Spray your cutting tool with a solution of water and alcohol b4 and after grafting
Make sure whatever you are grafting onto is in active growth
Learn to prepare/ wrap scion with parafilm b4 using
Try to graft with as fresh scion as possible to improve your success
Start watching Chris' grafting videos and also look up Dr. David Fairchild cleft graft and side Veneer graft videos.
Practice whatever feels more comfortable to you
Mike