Throw Back,
Here in NM you need either 2 years under someone or one of the approved university courses like Purdue and others offer.
I took the IPM from Purdue, great information, solid textbook of course, but ultimately while I'm sure you could head out and
do the work, working under someone for this seems sound.
Personally I did this because I couldn't find pest controllers willing to sub as many others have successfully done.
I haven't gone ahead with the license as I co-op with too many of them in that industry and honestly I'd rather send them their
work and keep my work strictly wildlife.
On the course though, solid info, I took the final at a local extension office where they "proctored" it to assure no cheating...
For the money it was educational, if you use it as a manual along with the product directions and instructions as Wink said, plus
do CEU's with your local pest control supplier (Univar etc...) I'm sure you can do this as many have.
I like learning on the job, but also realize many can't take an indentured position even paid due to constraints, which is why the other
academic options are available.