the law : you just don't pay 300 dollars and get an instructor License

c) A person seeking to become a certified firearms instructor shall:
(1) be at least 21 years of age;
(2) be a legal resident of the United States; and
(3) meet the requirements of Section 25 of this Act,
except for the Illinois residency requirement in item (xiv) of paragraph (2) of subsection (a) of Section 4 of the Firearm Owners Identification Card Act; and any additional uniformly applied requirements established by the Department.

(d) A person seeking to become a certified firearms instructor, in addition to the requirements of subsection (c) of this Section, shall:
(1) possess a high school diploma or high school
equivalency certificate; and
(2) have at least one of the following valid firearms
instructor certifications:
(A) certification from a law enforcement agency;
(B) certification from a firearm instructor
course offered by a State or federal governmental agency;
(C) certification from a firearm instructor
qualification course offered by the Illinois Law Enforcement Training Standards Board; or
(D) certification from an entity approved by the
Department that offers firearm instructor education and training in the use and safety of firearms.

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(c) An applicant for a new license shall provide proof of certification by a certified instructor that the applicant passed a live fire exercise with a concealable firearm consisting of:
(1) a minimum of 30 rounds; and
(2) 10 rounds from a distance of 5 yards; 10 rounds
from a distance of 7 yards; and 10 rounds from a distance of 10 yards at a B-27 silhouette target approved by the Department.
(d) An applicant for renewal of a license shall provide proof of completion of a firearms training course or combination of courses approved by the Department of at least 3 hours.
(e) A certificate of completion for an applicant's firearm training course shall not be issued to a student who:
(1) does not follow the orders of the certified
firearms instructor;
(2) in the judgment of the certified instructor,
handles a firearm in a manner that poses a danger to the student or to others; or
(3) during the range firing portion of testing fails
to hit the target with 70% of the rounds fired.