Hello, I have this tree that is about 6 feet tall which grew from seed. Still in a 3-gallon pot. I know, I need to plant it in ground.

For fruit, I am told I need to graft it.

My question: 1. Where should i get the scion? Buy online? This is my first time attempting to graft. Just seen YouTube videos.

2. Where on the plant should I graft? Would you cut off the main stem (about an inch thick) and graft there? See my illustration.

This is in Los Angeles.

Many thanks in advance.