2006 Unable to shift
 

Hey all I have a 2006 5.4 FX4 and I am able to shift the truck into park drive neutral and reverse just fine and the truck drives just fine but if I try to shift into 2 or 1 the gear shift wont go it feel like something is stuck or impeding it going into those gears...the only thing I know about transmissions is to take it to a professional but I have been ripped off a few times in the past any ideas would be greatly appreciated. Thanks also I can tow my boat just fine this is the first time I have noticed it..thanks again