I found this to be a quicker way.
Use your created superstar (most likely with Overall stats of 100), against Santino Marella in an Extreme Rules match, with 'falls count anywhere' set to OFF.
You want your character to have a move which is similar if not identical to John Cena's Attitude Adjustment. Go to the outside, send Santino out with you. Hit santino a couple of times with strong strikes until he's groggy, and then floor him with a standing clothesline, or whatever your character's strong strike attack is. Get a table from under the ring, then set it up quickly.
Go back to Santino. If you're quick, he should still be groggy and on the floor on the outside. Pick him up with RS-UP, and then use RS-UP again to use Attitude Adjustment. If you're parallel with the table, he should turn 90 degrees and slam Santino through the table. This will make him groggy, so get another table out from under the ring, set it up, and then pick up a groggy Santino with RS-UP, and repeat this last paragraph.
You should be able to get this within 30-40 minutes.
Hope this helps.