I`m just a beginner just voicing my opinion acquired from Erdnase.
There is a vast difference between the methods employed
by the card conjurer in mystifying or amusing his audience;
and those practiced at the card table by the professional, as
in this case the entire conduct must be in perfect harmony
with the usual procedure of the game.
Excessive vanity proves the
undoing of many experts. The temptation to show off is
great. He has become a past master in his profession.
To be suspected of skill is a death
blow to the professional.
To attain the highest degree
of excellence at card manipulation much study and
practice are necessary; but proficiency in the art quite
sufficient for the purpose of entertainment or amusement
may be acquired with very little effort if a thorough
understanding is first obtained of the best and simplest
methods of accomplishing the sleights.
http://conjuringarts.org/ give away free digital copy of Erdnase. May be you should re read it.