Mosiah 29 - Alma 1

We learn that -

"...in the first year of the reign of Alma in the judgment–seat, there was a man brought before him to be judged, a man who was large, and was noted for his much strength.
3 And he had gone about among the people, preaching to them that which he termed to be the word of God, bearing down against the church; declaring unto the people that every priest and teacher ought to become popular; and they ought not to labor with their hands, but that they ought to be supported by the people." (Book of Mormon Alma 1:2 - 3)

His name was Nehor and -

"...he also testified unto the people that all mankind should be saved at the last day, and that they need not fear nor tremble, but that they might lift up their heads and rejoice; for the Lord had created all men, and had also redeemed all men; and, in the end, all men should have eternal life." (Book of Mormon Alma 1:4)

Isn't it interesting that as soon as people hear what they want to hear, words that tend to justify them in their desires and their actions, they in turn tend to believe and support the source of the words for Nehor -

"...did teach these things so much that many did believe on his words, even so many that they began to support him and give him money..."

And as always seems to be a sign of those who do this for gain, Nehor -

"...began to be lifted up in the pride of his heart, and to wear very costly apparel, yea, and even began to establish a church after the manner of his preaching." (Book of Mormon Alma 1:6)
(Book of Mormon Alma 1:5)

Nephi defined priestcraft as -

"...priestcrafts are that men preach and set themselves up for a light unto the world, that they may get gain and praise of the world; but they seek not the welfare of Zion." (Book of Mormon 2 Nephi 26:29)

The serious nature of priestcrafts is specifically told to Nehor where Alma said -

"...this is the first time that priestcraft has been introduced among this people... and were priestcraft to be enforced among this people it would prove their entire destruction."
(Book of Mormon Alma 1:12)

For that reason, the Lord specifically -

"...commandeth that there shall be no priestcrafts...Behold, the Lord hath forbidden this thing..." (Book of Mormon 2 Nephi 26:29 - 30)

Alma records how the "priesthood" of God should really teach his children -

"...when the priests left their labor to impart the word of God unto the people, the people also left their labors to hear the word of God. And when the priest had imparted unto them the word of God they all returned again diligently unto their labors; and the priest, not esteeming himself above his hearers, for the preacher was no better than the hearer, neither was the teacher any better than the learner; and thus they were all equal, and they did all labor, every man according to his strength..." (Book of Mormon Alma 1:26)

And not only that, the consecrated "priesthood" leaders in Alma's day -

"...did impart of their substance, every man according to that which he had, to the poor, and the needy, and the sick, and the afflicted; and they did not wear costly apparel, yet they were neat and comely." (Book of Mormon Alma 1:27)

It then should be easy for man to diffentiate between those that practice priesthood and those that practice priestcraft.