The Entlebucher is the most intelligent breed of dog I have known. This is only an advantage if you have experience communicating with dogs. They certainly can and will challenge you. It's only a test. Knowing how to handle the pup's development will directly affect the grown dog you end up with.
Puppies go through developmental and fear periods.
It is absolutely essential you not only understand this, but know how to handle these periods. The socialization of your puppy is extremely important. Establishing a chain of command that places the dog below all the other family members must be understood. Communication is the key. It is not optional it is essential.