Stumbling Blocks are frustrating.  However, they can serve a great purpose. Is that stumbling block in your path there to trip you up and cause you to fall?  Maybe it is an indication that you need to go in a different direction.  It could be a warning that you are on a dangerous course.  A stumbling block could help you obtain a new skill.  And sometimes you just need to step right on top of that stumbling block and turn it into a steppingstone.