The Most Common Option (Anywhere On Land And Not The Bedrock Layer)

1. Face up and throw fire resistance, strength, and speed on to yourself

2. Run toward your opponent and hit them with your sword (Make sure to hit them into the air with a knockback 2 sword)

3. Place obsidian down (While their in the air taking knockback)

4. Place a end crystal on the obsidian (While their still in the air)

5. Punch the end crystal (The end crystal should blow up)

6. Repeat the process until their dead

The 2nd Most Common Option (On The Bedrock Layer In The Overworld)

1. Face up and throw fire resistance, strength, and speed on to yourself

2. Go to a 1 or 2 block hole of bedrock and stand in it

3. Place a end crystal on the walls of the bedrock

4. Punch the crystals (DO NOT JUMP! IF YOU CANT PUNCH IT LEAVE THE CRYSTAL THERE!)

5. If the person jumps in try kill him with your sword and don't try to put a crystal down

Theres a good guide in the credits section. (IT IS NOT MINE!!!)