I know some people that have "redesigned" the sound of TNT to a counter like "1... 2... 3.. 4... GO"give me tips
Personally, I don't use that technique, it's all about feeling and luck (you need good armor and water, if not, you failed already)
You can also try to count how long it takes in a single player world, and then join Cubecraft and try it!
To learn, you fail! In the beginning!