Step one, Harrison said, is doing everything he can to earn an NFL Combine invite where he sits on the bubble of an invite.
"I'm praying to get an invitation because I know what I can do in a situation like that," Harrison said. "Pro Day [at Rutgers] will be a huge opportunity, but I want a chance to do the same thing at the combine in front of every team."
Harrison has NFL size at 6-foot-3 and plans to show off his athleticism to any team willing to watch. Running cold, after a week away from workouts, Harrison reported a 4.50 40-yard dash and is aiming for a 4.38 at the end of his training.
"I'm going to surprise a lot of people," Harrison said.
"Right now they're helping me a lot with my technique and helping me with my explosiveness," Harrison said. "We're working on body movements and stuff. We go over a lot and they've been helping me develop the techniques you use in the combine and pro days."
Chambers works with NFL-hopeful receivers after retiring from a nine-year NFL career where he recorded 7,557 yards and 59 touchdowns. Marshall is spending his offseason in Florida after missing the playoffs with the Chicago Bears.
"It's a boost of confidence to have guys like them telling you what you need to work on and guiding you," Harrison said. "It's more motivation because it's my dream to be on their level."
Harrison admitted that he has a lot to learn from both receivers, but he does not have an issue keeping up in terms of athleticism.
"I've been doing this for the last six years of my life," he said. "I can keep up well. I believe I have what it takes, so I'm here to develop my game and learn from some of the best that know what it takes to play at that level."
Harrison plans to spend most of the next three months in Florida, but will return to Rutgers for Pro Day.