Indeed Steph, I agree with you on some points.
I think to access this profession you already need a good sense of logic.
At the Pôle Défense Mobilité (the army's retraining organisation), I had passed a good battery of tests corresponding to this field of retraining.
I still had a good foundation left from my Baccalaureate, both in drawing and mechanics. Before that, I had gone through microtechnology, which allowed me to acquire knowledge about machining.
For x reasons I kept my hand on the drawing whether it was for small personal projects or renovations of the house or even during my career as a sailor fuiliser, I even designed a hoop for our boats... well to be honest the first prototype had to be modified because with the accelerations we put in the Gu... combined with the state of the sea... well, uh... it has flexed !:)...
But we still got the result we wanted...
My last year in the army allowed me to get up to speed (thanks to the course provided by the trainer) and to prepare me for the training of BTS, calculus, RDM and so on.
In this training there were 2 training courses together, the BAC and BTS levels for the same duration...
But it is true that there were few people outside the milieu, and the few of these people had difficulty keeping up. After I also think (without wanting to criticize) that it was due to their ability to understand and adapt ... The other people in BTS came either from an "assembler" background at AIRBUS for example or from maintenance technicians... But always linked to mechanics and technique, they had good background in relation because they were well versed in pure mechanics and a lot of experience in terms of knowledge of mechanisms.
Maybe Nadine, if it exists (to be checked), you should do a personality and psychotechnical test (related) to this job, to be sure that it suits you.
This job can be very stressful in some cases and depending on the company you join.
In design you must be able to link skills in calculation (a lot of math), RDM, speed of execution.... and especially of ideas/ingenuity ... and there are times when it comes and other times when it's total white for a day... (well for my part) :)... Not to mention the stress of the client who wants the project for yesterday ... ^^
I hope I helped you.
Kind regards.