Interesting. Do you tell other IWC folks what they do isn't "hard" to learn?
There is no need to tell anyone anything, it's a known quantity. If you graduated from college and made it through the DCO selection process, you will do well in practically any Reserve designator. This is not the NUC pipeline.
By "well", I mean you will be able to graduate from the particular training for your designator, as well as will be able to "pass" you PQS and board. Doing "well" career wise requires you to do your job well, as well as to do the collateral things that are required of Officers in the Reserve: admin officer, training officer, ops officer, etc.
At least for Intel/CW/IP, you are provided with "gouge booklets" for your PQS and board, are put through multiple "murder boards" (i.e., mock qual boards), and are given multiple opportunities to "pass."
For me, at least, having gone through the "experience" that is comprised of mess cranking, qualifying in submarines, and going to dive school, I've not found the Reserve to be particularly difficult nor challenging. Then again, my bar is always set high which is my fault.
All of the DCO folks I've come across are either straight up civilians or people like me with prior experience. Despite their day jobs (e.g., teacher, FLEO, banker, attorney, lawn care business owner, sales person, college IT employee, govvie employee) they have all become fully qualified in their designators. They are all smart and driven.