Yet Another NEW Snapshot 21w08b! Here are notes for NBTExplorer

 OK, since I created a new world, and forgot to turn on cheats, I am using NBTExplorer to do my starting out cheats.  I started a little normal, mined, found iron, made an iron pick, found diamonds, made ONE diamond pick to mine more diamonds, some Lapis, and Obsidian to make an enchantment table (instead of using my diamonds to make tools) I forgot about NBTExplorer until I made the Enchantment table, so all of this was after I got the Enchantment Table and a little bit of Lapis.  I made a stone shovel. This is the only thing that I will leave in my inventory.

Recipe for Stone Shovel

Crafted Shovel in Inventory

OK, now I enchant the stone shovel with any enchantment. I use the Enchantment

table without any bookshelves (I didn't have any yet, anyway).

I got Efficiency I Enchantment (doesn't matter)

Now I saved the game and exited down to the Single/Multiple Player game menu. I then minimized the window and opened up NBTExplorer and used it to open my saved game. I worked my way down and clicked on the "+" symbols to open the next layer of data. ( level.dat/Data/Player/Inventory) I've added the next image because I didn't have the original one with the shovel at this point.

OK, here is the one with the Stone Shovel, note that it's name is stone_shovel, with no capital letters and the underline replacing the space.

Next, I select the line below the "Enchantments" entry, and I copy it with Ctrl-C

Now, I select the Enchantments line. When I paste the copied item here, it will actually paste under this line and create a new entry.

I pressed Ctrl-V to paste the line 3 times. This gives me a total of 4 entries for the shovel's Enchantments.

When I open up each of the 4 entries, they all read the same.

Since I don't want them to be the same, I double-click each one in turn and edit them to the Enchantments that I want. Mending, LvL 1. Unbreaking, LvL 10000. Fortune, LvL 100. And, Efficiency, LvL 3.  NOTE: I've capitalized the Enchantments in this text, but NOT with the edit.

I also changed the "count" to 7 because I want to make 7 items with these same basic Enchantments.

I forgot, and had to go back in and rename the shovel to be a "diamond_shovel" instead of stone.

Now I can spread out the shovels, go back into NBTExplorer and make Diamond Sword, Pick, Axe, Shovel, Hoe just by renaming it.  I will also make some items silk_touch, or looting.