Have you already shot this? (mistaaaaaake)
Is the camera moving? (MISTAAAAAAKE)
If these things are true, it’s going to make it very difficult to make it look good.
There are some tutorials that will help with the shattering of the person.
This one, this one part one and part two, this one and (while I’m at it) this one wouldn’t hurt for the rest of your project.
Although, you might just play with the shatter effect; depending on what you’re going for.
A quick After Effects Community Help Search turns up these and more! You will probably want to use this search feature a lot; it’s great.
However, no matter how good your shattering-person skills are, if your camera is moving and you don’t have a clean background plate, it’s going to get more difficult. You will have to create a clean background plate (grass on a football field, I’m guessing), and motion track it to the scene. You will also probably need to do some rotoscoping to put your guy into your new grass before he shatters/explodes/disintegrates.
– The Great Szalam
(The ‘Great’ stands for ‘Not So Great, in fact, Extremely Humble’)
No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.