Chicago Bears Football Bedding

what are my chances playing american profootball without any college?
There was just a question about Brock Lesnar in the NFL so i'll use him as an example.
As everyone knows, Lesnar is a beast. His attributes make him a freak of nature. He's an ex NCAA National Champion in Wrestling. He never played football in college but was given a chance at making the Vikings roster in 04'. Again, his athletic abilities were superb but in the end he was years behind a typical player and cut.
Kurt Angle is another example. He was given a tryout with the Steelers after he won his Olympic Gold medal in wrestling. He was promptly told "no thanks" and turned to pro wrestling.
If guys like them with their abilities are longshots without prior experience, you can only imagine how bad the odds are for us less accomplished people. I doubt a regular guy without their kind of resumes would even be given a shot.