Relax. These suggestions will get the hose connection more secure, but if you got it on far enough that the clamp has good traction and is biting cleanly on the line, it's probably just fine. Put it on the keg and see.
Sometimes new brewers/keggers get so paranoid about making a mess they get analysis paralysis, but this is basic stuff. Put the hose on the barb, tighten it down with a clamp. Use it.
First Brew was thanksgiving 2011, I'm at 86 batches and counting (as of 7/17/2014), and ran out of room in my signature to list them all.